10 Signs and Symptoms of Iodine Deficiency (2024)

Iodine is an essential mineral commonly found in seafood.

Your thyroid gland uses it to make thyroid hormones, which help control growth, repair damaged cells and support a healthy metabolism.

Unfortunately, up to a third of people worldwide are at risk of an iodine deficiency Those at the highest risk include

  • Pregnant Women
  • People who live in countries where there is very little iodine in the soil. This includes Australia, New Zealand, South Asia, Southeast Asia, and European countries
  • People who don’t use iodized salt
  • People who follow a vegetarian or vegan diet

Iodine deficiency can cause uncomfortable and even severe symptoms. They include swelling in the neck, pregnancy complications, cognitions issues and weight gain.

The symptoms are very similar to those ofhypothyroidism, or low thyroid hormones. Since iodine is used to make thyroid hormones, an iodine deficiency means your body can’t make enough of them, leading to hypothyroidism.

People must also be careful not to over supplement with iodine. Excess levels without selenium is associated withincreased thyroid autoimmunity, so you must be careful not to over supplement your iodine intake. I always get my hypothyroid patients run a iodine, selenium and tyrosine test to ensure optimal levels.

Here are 10 signs and symptoms of an iodine deficiency.

Get the latest ThyroidResearchNewsTreatmentsInformationAdvice

Enter your email below

1. Unexpected Weight Gain

Unexpected weight gain is another sign of an iodine deficiency. It may occur if the body does not have enough iodine to make thyroid hormones.

This is because thyroid hormones help control the speed of your metabolism, which is the process by which your body converts food into energy and heat.

When your thyroid hormone levels are low, your body burns fewer calories at rest. Unfortunately, this means more calories from the foods you eat are stored as fat.

Adding more iodine to your diet may help reverse the effects of a slow metabolism, as it can help your body make more thyroid hormones.

10 Signs and Symptoms of Iodine Deficiency (1)

2. Swelling of The Neck

Swelling in the front of the neck is the most common symptom of an iodine deficiency. This is called a goiter and occurs when the thyroid gland grows too big.

The thyroid gland is a small, butterfly-shaped gland in the front of your neck. It makes thyroid hormones upon receiving a signal from the thyroid-stimulating hormone (TSH).

When blood levels of TSH rise, the thyroid gland uses iodine to make thyroid hormones. However, when your body is low in iodine, it can’t make enough of them.

To compensate, the thyroid gland works harder to try to make more. This causes the cells to grow and multiply, eventually leading to a goiter.

Fortunately, most cases can be treated by increasing your iodine intake. However, if a goiter hasn’t been treated for many years, it might cause permanent thyroid damage.

3. Hair Loss

Thyroid hormones help control the growth of hair follicles. When your thyroid hormone levels are low, your hair follicles may stop regenerating. Over time, this may result in hair loss. For this reason, people with an iodine deficiency may also suffer from hair loss.

One studyin 700 people found that 30% of those with low thyroid hormone levels experienced hair loss.

If you experience hair loss because of an iodine deficiency, getting enough of this mineral may help correct your thyroid hormone levels and stop hair loss.

4. Fatigue

Fatigue and weakness are common symptoms of an iodine deficiency. These symptoms occur because thyroid hormones help the body make energy.

When thyroid hormone levels are low, the body can’t make as much energy as it usually does. This may cause your energy levels to plummet and leave you feeling weak.

A 2017 studyin 2,456 people found that fatigue and weakness were the most common symptoms among those with low or slightly low thyroid hormone levels.

When people are fatigued it causes them to seek out high amounts of calories in the form of processed food. This helps to boost energy levels slightly, however, it leads to significant weight gain. Fatigue also lowers people’s ability to exercise, exacerbating the weight gain.

10 Signs and Symptoms of Iodine Deficiency (2)

5. Feeling Colder Than Usual

Feeling cold is a common symptom of an iodine deficiency.

As iodine is used to make thyroid hormones, an iodine deficiency can cause your thyroid hormone levels to plummet. Given that thyroid hormones help control the speed of your metabolism, low thyroid hormone levels may cause it to slow down. A slower metabolism generates less heat, which may cause you to feel colder than usual.

Also, thyroid hormones help boost the activity of your brown fat, a type of fat that specializes in generating heat. This means that low thyroid hormone levels, which may be caused by an iodine deficiency, could prevent brown fat from doing its job.

6. Dry, Flaky Skin

Dry, flaky skin may affect many people with an iodine deficiency.

Thyroid hormones, which contain iodine, help your skin cells regenerate. When thyroid hormone levels are low, this regeneration doesn’t occur as often, possiblyleading to dry, flaky skin.

Additionally, thyroid hormoneshelp the body regulate sweat. People with lower thyroid hormone levels, such as those with an iodine deficiency, tend to sweat less than people with normal thyroid hormone levels.

Given that sweat helps keep your skin moist and hydrated, a lack of sweat may be another reason why dry, flaky skin is a common symptom of iodine deficiency.

7. Changes in Heart Rate

Your heart rate is a measure of how many times your heart beats per minute. It may be affected by your iodine levels. Too little of this mineral could cause your heart to beat slower than usual, while too much of it could cause your heart to beat faster than usual.

A severe iodine deficiency may cause an abnormally slow heart rate. This could make you feel weak, fatigued, dizzy and possibly cause you to faint.

Share this article with friends

8. Heavy or Irregular Periods

Heavy and irregular menstrual bleeding may occur asa result of an iodine deficiency. Like most symptoms of iodine deficiency, this is also related to low levels of thyroid hormones, given that iodine is needed to make thyroid hormones.

In one study, 68% of women with low thyroid hormone levels experienced irregular menstrual cycles, compared to only 12% of healthy women.

Research also shows that women with low thyroid hormone levels experience more frequent menstrual cycles with heavy bleeding. This is because low thyroid hormone levels disrupt the signals of hormones that are involved in the menstrual cycle.

9. Issues With Learning and Memory

An iodine deficiency may affect your ability to learn and remember.

A study includingover 1,000 adults found that those with higher thyroid hormone levels performed better on learning and memory tests, compared to those with lower thyroid hormone levels.

Thyroid hormones help your brain grow and develop. That’s why an iodine deficiency, which is required to make thyroid hormones, can reduce brain development.

In fact,studies have foundthat the hippocampus, the part of the brain that controls long-term memory, appears to be smaller in people with low thyroid hormone levels.

10 Signs and Symptoms of Iodine Deficiency (3)

10. Pregnancy Complications

Pregnant women are at a high risk of iodine deficiency.

This is because they need to consume enough to meet their own daily needs, as well as the needs of their growing baby. The increased demand for iodine continues throughout lactation, as babies receive iodine through breast milk.

Not consuming enough iodine throughout pregnancy and lactation may cause side effects for both the mother and baby.

Mothers may experience symptoms of an underactive thyroid, such as a goiter, weakness, fatigue and feeling cold. Meanwhile, an iodine deficiency in infants maystunt physical growth and brain development.

Furthermore, a severe iodine deficiency mayincrease the risk of stillbirth.

You can see that Iodine is an essential nutrient and plays critical roles in metabolism, energy and reproduction. This critical nutrient is so vital that I reccomend most of my patients perform an Iodine test, especially if you are suffereing from hypothyroidism or planning on becoming pregnant.

Food Sources of Iodine

Food

Iodine content (µg per 100g)

Oysters

160

Sushi (containing seaweed)

92

Tinned salmon

60

Bread (made with iodised salt)

46

Steamed snapper

40

Cheddar cheese

23

Eggs

22

Ice cream

21

Chocolate milk

20

Flavoured Yoghurt

16

Regular milk

13

Tinned tuna

10

Bread (without iodised salt)

3

Beef, pork, lamb

<1.5

Tap water (varies depending on site)

0.5-20.0

Apples, oranges, grapes, bananas

<0.5

Iodine recommendations in Australia and New Zealand

Age and Gender

RDI

1-8yrs boys and girls

90µg/day

9-13yrs boys and girls

120 µg/day

14-18yrs boys and girls

150µg/day

19->70yrs men

150µg/day

19->70yrs women

150µg/day

Pregnancy

220µg/day

Lactation

270 µg/day

Book Now

Get the latest ThyroidResearchNewsTreatmentsInformationAdvice

Enter your email below

10 Signs and Symptoms of Iodine Deficiency (4)

Kayla Mignone

Kayla’s personal experience with thyroid issues, autoimmune conditions, and digestive complaints, brings a wealth of experience to her academic career and personal consultations. Her passion came from the inability to find help in the mainstream medical community. Using scientifically-proven natural health protocols, Kayla helps people navigate their health issues and has dedicated her career to helping her patients take control of their health.

More Posts about Thyroid

Gluten and Thyroid disease; What’s the Connection?

Kayla Mignone

Autoimmune thyroid disorders are becoming increasingly more common, with one in eight people (mostly women) diagnosed with a thyroid disease at some stage during their

Read More »

Iodine for Hypothyroidism: Crucial Nutrient or Harmful Toxin?

Kayla Mignone

My clients often complain of their thyroid hormone replacement not working. One of the reasons can be due to a suboptimal iodine intake, as both

Read More »

Adelaide Hashimoto Naturopath – Thyroid Treatment

Kayla Mignone

Hashimoto Thyroiditis Kayla Mignone BHScThyroid Specialist After being diagnosed with Hashimoto’s myself, this is an extremely passionate topic of mine. Did you know Adelaide Hashimoto

Read More »

5 Thyroid Issues That Don’t Show Up On Standard Lab Tests

Kayla Mignone

5 Thyroid Issues That Don’t Show Up On Standard Lab Tests With thyroid issues, the key to choosing the best treatment lies in accurate diagnosis.

Read More »

10 Signs and Symptoms of Iodine Deficiency (2024)

FAQs

10 Signs and Symptoms of Iodine Deficiency? ›

Consumption of foods that contain goitrogens, substances that interfere with the uptake of iodine in the thyroid, can exacerbate iodine deficiency [2]. Foods high in goitrogens include soy, cassava, and cruciferous vegetables (e.g., cabbage, broccoli, and cauliflower).

What are the signs that the body is too low on iodine? ›

Symptoms of iodine deficiency and related thyroid disorders can include:
  • Swelling of thyroid glands in the neck.
  • A visible lump (goiter) on your neck.
  • Weight gain, fatigue and weakness.
  • Thinning hair.
  • Dry skin.
  • Feeling colder than usual.
  • Slowed heart rate.
  • Learning and memory difficulties.

What depletes iodine in the body? ›

Consumption of foods that contain goitrogens, substances that interfere with the uptake of iodine in the thyroid, can exacerbate iodine deficiency [2]. Foods high in goitrogens include soy, cassava, and cruciferous vegetables (e.g., cabbage, broccoli, and cauliflower).

What are the two major consequences of iodine deficiency? ›

It results in impaired cognitive and motor development which affects a child's performance at school. In adulthood, it affects productivity and the ability to find a job. Iodine-deficient people may forfeit 15 IQ points, and nearly 50 million people suffer from some degree of iodine deficiency-related brain damage.

Can low iodine make you dizzy? ›

Slow heartbeat: If you consume too little or too much iodine, your heart may beat more slowly or quickly than usual. An unusually slow heartbeat may result from a severe iodine deficit. You can feel tired, worn out, dizzy, and even faint.

What organ does iodine affect? ›

Without enough iodine, these thyroid hormones do not work properly and can lead to an under-active or overactive thyroid gland, causing the medical conditions of hypothyroidism and hyperthyroidism with various negative side effects in the body.

How long does it take to fix iodine deficiency? ›

Take one tablet a day for 90 days (6-12 mg a day is fine). After three months, if you feel much better you can stay on the supplement. Or you can stop it and see if your problems worsen, a sign that you still need it. (You may find that one bottle is enough to "fill your tank" and correct your deficiency.)

What part of the body is most affected by iodine? ›

Iodine is mostly concentrated in thyroid gland(2). A healthy adult body contains 15-20 mg of iodine, 70-80% of which is stored in the thyroid gland.

Which fruit is rich in iodine? ›

Fruits: Few fruits like Strawberries, Cranberries and Pineapple are an excellent and rich source of iodine.

What disease causes lack of iodine? ›

Iodine deficiency is the most common cause of thyroid disease and, if serious, can cause permanent brain damage and intellectual disability in babies. Iodine is a mineral found naturally in seawater and soil. The body needs iodine to make thyroid hormone in the thyroid gland.

What is the most common cause of iodine deficiency? ›

Iodine deficiency occurs when the soil is poor in iodine, causing a low concentration in food products and insufficient iodine intake in the population.

Can low iodine cause brain fog? ›

Iodine deficiency results in hypothyroidism. Symptoms can include fatigue, depression, anxiety, brain fog, headaches, constipation, hair loss, weight gain, and sensitivity to cold temperatures. The thyroid gland may be enlarged causing a bulge in the neck called a goiter.

What does iodine do to the brain? ›

Iodine is also essential for brain development during specific time windows influencing neurogenesis, neuronal and glial cell differentiation, myelination, neuronal migration, and synaptogenesis.

Is anxiety a symptom of iodine deficiency? ›

Studies have indicated that low iodine levels can contribute to mental health problems, including anxiety and depression. The thyroid hormones influenced by iodine play a vital role in brain development and neurotransmitter regulation, which directly affect mood and emotional wellbeing.

Why does iodine make me feel better? ›

Iodine helps make thyroid hormones, which help keep cells and the metabolic rate (the speed at which chemical reactions take place in the body) healthy.

Does low iodine affect blood pressure? ›

Iodine deficiency during pregnancy is serious for both the mother and the baby. It can lead to high blood pressure during pregnancy for the mother, and mental retardation for the baby. Iodine plays an important role in development of the central nervous system.

Does iodine affect kidneys? ›

Serious kidney damage can be caused by the iodine-containing “dyes” that doctors use to enhance the quality of medical scans. These dyes are called contrast agents, and are usually given intravenously before a CT scan, angiogram or other test.

How do you check iodine levels? ›

Blood test: This is a simple and accurate test for iodine levels in the body, but it takes more time to read than a urine test. Iodine patch test: The iodine patch test is a test where doctors paint a patch of iodine on your skin and check how it looks 24 hours later.

How long does it take for iodine to work? ›

You may notice improvements in energy within one month of supplementing with iodine. Consistency is key and our research recommends taking your Feel supplements for at least 3 months to allow your body to adjust and provide the desired benefits.

What form of iodine is best? ›

The best iodine supplement is generally recognized to be potassium iodide. However, getting the necessary amount shouldn't require supplementation unless you're pregnant or breastfeeding. Some “natural” iodine supplements like kelp may deliver erratic and sometimes toxic levels of iodine.

How can I increase my iodine levels quickly? ›

Fish (such as cod and tuna), seaweed, shrimp, and other seafood, which are generally rich in iodine. Dairy products (such as milk, yogurt, and cheese) and eggs, which are also good sources of iodine. Iodized salt, which is readily available in the United States and many other countries*

Where is iodine deficiency most common? ›

Iodine deficient soils are most common in inland regions, mountainous areas and areas of frequent flooding, but can also occur in coastal regions (2). This arises from the distant past through glaciation, compounded by the leaching effects of snow, water and heavy rainfall, which removes iodine from the soil.

How do you tell if your thyroid is off? ›

8 signs that your thyroid hormones are out of balance
  1. Fluctuating pulse rate. Thyroid hormones help regulate your heart beat. ...
  2. Weight gain or loss. Unintentional weight gain or loss can be a sign of hormone imbalance. ...
  3. Changes in skin. ...
  4. Feeling tired. ...
  5. Issues with eyes. ...
  6. Formation of a lump. ...
  7. Heightened emotions. ...
  8. Problems with sleep.
Jan 9, 2021

What are early warning signs of thyroid problems? ›

What Are the Early Warning Signs of Thyroid Problems?
  • Feeling tired or lacking energy even after getting enough sleep.
  • Sudden weight loss or weight gain that cannot be explained by changes in diet or exercise.
  • Mood swings, irritability, anxiety, or depression.
  • Sleep disturbances, insomnia, or excessive sleepiness.
Feb 10, 2023

What vegetable is highest in iodine? ›

Hands down, seaweed is the best source of iodine available. A 10 gram serving of dried nori seaweed (the type of seaweed used in sushi) contains up to 232 mcg of iodine, more than 1.5 times the daily required minimum.

Do bananas contain iodine? ›

Do Bananas Have Iodine? Yes, bananas contain this element (6). Therefore, it is supremely important to calculate how much you can eat in order not to go over your daily iodine limit. One medium banana holds about 2% of the daily iodine value.

What food has the most iodine? ›

The foods highest in iodine include seaweed, dairy, tuna, shrimp and eggs. Additionally, most table salt has been iodized, providing an easy way to add iodine to your meals.

How do I know if I need iodine supplement? ›

One of the most common results of low iodine is that your thyroid can't make enough thyroid hormone, a condition called hypothyroidism. This might inflame the gland and cause a goiter, but not always. It could also thin your hair, dry your skin, and make you feel cold, tired, constipated, and depressed.

What does thyroid tiredness feel like? ›

With thyroid fatigue, you may feel like you can't get through a day without a nap. You may sleep more than usual but still feel completely exhausted. You may not even have the energy to exercise. At times, you may fall asleep during the day or very quickly at night.

What does a thyroid headache feel like? ›

People with hypothyroidism may also have headaches, including pulsing pain, on both sides of the head. In most cases, the headaches subside after the person receives effective treatment for hypothyroidism.

Does iodine affect memory? ›

Learning or memory problems

Iodine deficiency may cause a lack of these hormones, resulting in problems with memory and learning new things. A 2014 study found that the hippocampus was smaller in people with low levels of thyroid hormones. The hippocampus is the part of the brain that affects memory.

Is it good to take iodine everyday? ›

Getting enough iodine is essential for ensuring proper thyroid function. Getting too much, however, can lead to problems as well. Getting too much iodine can lead to iodine toxicity. Symptoms range depending upon how much you take, and they can range from nausea and vomiting to a weak pulse and delirium.

How do you feel after taking iodine? ›

A swollen or tender neck and feeling flushed

Some people may have a feeling of tightness or swelling in their neck for a few days after treatment. This is more common if you still had a large part of your thyroid gland when you have radioactive iodine treatment. Some people also feel flushed.

What does thyroid anxiety feel like? ›

Anxiety Symptoms to Watch For

If you've been diagnosed with hypothyroidism, anxiety symptoms to monitor yourself for include: Insomnia. Feeling “on edge” a lot. Muscle tension.

What is your body lacking when you have anxiety? ›

Vitamin B deficiency (B1, B6, B7, B12, B complex) can contribute to depression, anxiety, and mood swings. It is associated with a disruption in the nervous system as well as the circulatory system. B12/B9, or folate, is at the forefront of mood management.

Does iodine affect nerves? ›

Peripheral Neuropathy: Iodine Deficiency can also damage the body's peripheral nerves. In this condition, one can face several issues, such as tingling in the hands or feet, sharp, stabbing pains, numbness in the hands or feet, thinning of the skin, drop in blood pressure and others.

What to avoid when taking iodine? ›

AVOID THE FOLLOWING FOODS
  • Iodized salt.
  • Any vitamins or supplements that contain iodine (especially kelp and dulse)
  • Milk or other dairy products including ice cream, cheese, yogurt and butter.
  • Seafood including fish, sushi, shellfish, kelp or seaweed.
  • Herbal supplements.

Does iodine make you sleepy? ›

Excess Iodine. For some people with abnormal thyroid glands, excessive iodine can trigger or worsen hypothyroidism. While initially, you may have more energy, high doses can cause an "iodine crash" that leaves you feeling exhausted and achy within a few days.

Does iodine help with fatigue? ›

Low iodine levels may leave you feeling tired, sluggish and weak. This is because your body needs the mineral to make energy.

Who should avoid iodine? ›

If the underactive thyroid isn't caused by iodine deficiency, then iodine supplements give no benefit and shouldn't be taken. In fact, for some people with an underactive thyroid, too much iodine can cause or worsen their condition.

Does iodine affect the heart? ›

Excess iodine exposure can cause heart failure due to hypothyroidism, hyperthyroidism, or direct cardiac toxicity. Acute excess iodine exposure results in transient hypothyroidism termed the Wolff-Chaikoff effect and is thought to be mediated by thyroid peroxidase inhibition.

What does too much iodine feel like? ›

Acute iodine toxicity is rare and is often difficult to recognize. Clinical manifestations may range from nausea, vomiting, and diarrhea to delirium, stupor, and shock.

Who shouldn't take iodine? ›

If the underactive thyroid isn't caused by iodine deficiency, then iodine supplements give no benefit and shouldn't be taken. In fact, for some people with an underactive thyroid, too much iodine can cause or worsen their condition.

For which organ is iodine intake most important? ›

An essential mineral, iodine is used by the thyroid gland to make thyroid hormones that control many functions in the body including growth and development.

Which foods are rich in iodine? ›

Fish (such as cod and tuna), seaweed, shrimp, and other seafood, which are generally rich in iodine. Dairy products (such as milk, yogurt, and cheese) and eggs, which are also good sources of iodine. Iodized salt, which is readily available in the United States and many other countries*

Top Articles
Latest Posts
Article information

Author: Frankie Dare

Last Updated:

Views: 6356

Rating: 4.2 / 5 (53 voted)

Reviews: 92% of readers found this page helpful

Author information

Name: Frankie Dare

Birthday: 2000-01-27

Address: Suite 313 45115 Caridad Freeway, Port Barabaraville, MS 66713

Phone: +3769542039359

Job: Sales Manager

Hobby: Baton twirling, Stand-up comedy, Leather crafting, Rugby, tabletop games, Jigsaw puzzles, Air sports

Introduction: My name is Frankie Dare, I am a funny, beautiful, proud, fair, pleasant, cheerful, enthusiastic person who loves writing and wants to share my knowledge and understanding with you.