This article is written by mr.hotsia, a curious traveler who has spent years exploring Thailand, Laos, Vietnam, Cambodia, Myanmar, India and many other Asian countries.
In village clinics, big-city hospitals and small labs above markets, I keep seeing the same words on paper:
“TSH high”
“Hypothyroidism”
“Underactive thyroid”
People often look at me and ask:
“Is this a rare disease or do many people have it? Am I unlucky, or is hypothyroidism actually common?”
The calm answer is:
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Yes, hypothyroidism is common worldwide.
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It is more common in women than in men.
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It becomes more frequent with age, especially in middle age and older adults.
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Many people have mild forms that are not diagnosed for years.
Let us walk through what “common” really means in everyday life.
How common is hypothyroidism in general?
As I travel from Chiang Rai to Delhi, from Vientiane to Phnom Penh, I notice that thyroid clinics are never empty.
In many countries:
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Hypothyroidism is one of the most common hormone disorders.
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Millions of people live with an underactive thyroid, often for a long time.
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Some know it and take medication. Others have symptoms but have never been tested.
So if you have hypothyroidism, you are far from alone. You are walking a road that many other people are also walking, in your country and across the world.
Is hypothyroidism more common in women?
Yes. In almost every country I visit, doctors say the same thing:
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Women are several times more likely than men to have hypothyroidism.
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This is especially true for autoimmune thyroid disease, like Hashimoto’s.
Possible reasons include:
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Differences in the immune system between women and men
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Hormone changes across life, such as pregnancy and menopause
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Genetic tendencies that show up more often in women
In many waiting rooms I see mostly women sitting with thyroid lab results, while their brothers or husbands may have normal thyroid tests.
Does age affect how common hypothyroidism is?
Yes. The chance of having hypothyroidism often increases with age.
Common patterns I see on the road:
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It can appear at any age, even in young adults.
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It becomes more common in middle age, especially in women.
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In older adults, mild hypothyroidism is not rare. Some have clear symptoms, others do not.
In many families I meet, the story goes like this:
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A mother is diagnosed in her forties
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An aunt in her fifties
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A grandmother who always said she was “cold and tired” was probably never tested
This shows that age and family patterns both matter.
What about “silent” or undiagnosed hypothyroidism?
In markets and temples, I meet many people who say:
“I am always tired, gaining weight, feeling cold and sad, but my doctor never checked my thyroid.”
Because symptoms of hypothyroidism are very general, they are easy to blame on:
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Hard work
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Getting older
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Stress
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Not enough sleep
This means:
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Some people have undiagnosed hypothyroidism for months or even years.
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They are counted as “healthy” in daily life, but their thyroid is already struggling quietly.
When they finally get a blood test, they often say:
“Now it makes sense. This has probably been going on for a long time.”
So if we include undiagnosed cases, hypothyroidism is even more common than official numbers suggest.
Is hypothyroidism more common in some parts of the world?
From mountain villages to coastal cities, thyroid stories look a bit different.
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In some regions with low natural iodine, thyroid problems used to be very common before iodised salt was introduced.
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In many modern urban areas, autoimmune thyroid disease has become the main cause.
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Some populations have a stronger genetic tendency toward thyroid issues.
Even with these differences, the overall picture is clear:
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Nearly every country I visit has many people with underactive thyroids.
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In big hospitals, thyroid clinics are always busy.
Hypothyroidism is not a rare disease of one specific country or diet. It is a worldwide companion.
Is hypothyroidism more common in people with other autoimmune diseases?
Yes. As I talk with people in hospital corridors, I often see a pattern:
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Someone with type 1 diabetes, vitiligo, celiac disease or another autoimmune condition
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Later develops autoimmune thyroid disease as well
This happens because:
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The immune system has a higher tendency to attack the body’s own tissues.
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The thyroid is a common target.
So in groups with other autoimmune conditions, hypothyroidism is even more common than in the general population.
Is hypothyroidism becoming more common over time?
In many countries, more people are being told:
“You have hypothyroidism. You need thyroid medication.”
Why this is happening:
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Better awareness and testing
More doctors check thyroid levels when people report tiredness, weight changes or mood problems. -
Aging populations
As people live longer, more age related thyroid changes are found. -
Possible changes in environment and lifestyle
These may affect how the immune system behaves, although details are still being studied.
So it is difficult to say whether the disease itself is always increasing, but the number of diagnosed people is definitely high, and thyroid pills are among the most commonly prescribed medications in many places.
Is mild or “borderline” hypothyroidism common?
Yes. Many people have what doctors call subclinical hypothyroidism:
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TSH is slightly high
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Thyroid hormone levels are still in the normal range
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Symptoms may be mild or not obvious
This is quite common in:
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Older adults
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People with autoimmune thyroid antibodies
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Some women after pregnancy
Doctors may choose to:
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Watch and repeat tests
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Or treat, depending on symptoms, age and other health risks
This group adds another large layer to how common thyroid slowing really is.
If hypothyroidism is common, does that mean it is “no big deal”?
Common does not mean unimportant.
On my journeys I meet two dangerous attitudes:
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Ignoring it entirely
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“Everyone has thyroid problems now, I do not need to worry.”
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Being terrified
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“My thyroid is slow, my life is over.”
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The healthy middle view is:
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Hypothyroidism is common and usually very manageable.
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It still needs proper treatment and regular checkups.
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With good care and daily habits, most people live normal lives.
So yes, many people share this condition with you, but that does not mean you should neglect it.
FAQs: Is hypothyroidism common?
1. Is hypothyroidism a rare disease?
No. Hypothyroidism is one of the most common hormone related conditions worldwide. Many millions of people live with an underactive thyroid.
2. Who gets hypothyroidism more often, men or women?
Women are more likely than men to develop hypothyroidism, especially from autoimmune causes such as Hashimoto’s thyroiditis.
3. At what age is hypothyroidism most common?
It can occur at any age, but it is more common in middle age and older adults. Many diagnoses are made in people in their 40s, 50s and beyond.
4. Is hypothyroidism common in my country, or only in Western countries?
It is common in many parts of the world, including Asia. In every country I visit, thyroid clinics are busy and thyroid pills are widely used.
5. Are there many people with hypothyroidism who do not know they have it yet?
Yes. Because symptoms are general and develop slowly, some people live for years with undiagnosed hypothyroidism until someone checks their thyroid with a blood test.
6. Is mild or “borderline” hypothyroidism also common?
Yes. Many people have slightly abnormal thyroid tests with mild or no symptoms. This is especially common in older adults and those with autoimmune tendencies.
7. Are people with other autoimmune diseases more likely to have hypothyroidism?
They are. Conditions like type 1 diabetes, vitiligo and celiac disease often travel together with autoimmune thyroid disease.
8. Is hypothyroidism becoming more common over time?
More people are being diagnosed, partly because doctors test more often and populations are aging. Whether the true disease rate is rising everywhere is still being studied.
9. If hypothyroidism is common, does that mean I should not worry about it?
Being common does not mean it can be ignored. It is usually manageable, but it still needs proper treatment and follow up to protect long term health.
10. What is the simplest way to think about how common hypothyroidism is?
Think of hypothyroidism as a very common travel companion of modern life. Many people quietly carry it in their pockets along with their thyroid pills. You are not alone, and with informed care, it can become just one part of your story, not the whole story.
I’m Mr.Hotsia, sharing 30 years of travel experiences with readers worldwide. This review is based on my personal journey and what I’ve learned along the way. Learn more |