Chest X-Ray vs CT Scan Difference: Why Your Doctor Chooses One Instead of the Other

“You’re just tired.” “It’s stress.” “It’s your age.” “It’s because you recently had a baby.”

Many women hear these words when they talk about feeling tired, gaining weight, losing hair or having changes in their periods. These problems can be linked to everyday life, but they can also be signs of a thyroid problem.

The thyroid is a small gland in your neck that helps control how your body uses energy. When it does not work as it should, you may notice changes in your body, mood and daily life.

A TSH test measures thyroid-stimulating hormone, a signal sent by your brain to your thyroid. It is usually the first blood test doctors use to check how well your thyroid is working.

In this blog, we explain what TSH means, how results can change at different stages of life, what high and low levels may mean, and why thyroid testing matters for women in India.

First, what is TSH actually telling you?

TSH stands for thyroid-stimulating hormone. It is made by a small part of your brain called the pituitary gland. This hormone tells your thyroid gland how much thyroid hormone to make.

Your thyroid makes two main hormones: T4 and T3. These help your body use energy and support your heart rate, mood, body temperature and menstrual cycle.

Think of TSH as a thermostat in your home. A thermostat tells a heater when to produce more or less heat. In the same way, TSH helps your thyroid know when to make more or less hormone.

• When TSH is high: Your thyroid may not be making enough hormone, so your brain sends a stronger signal to it. This often points to an underactive thyroid.
• When TSH is low: Your thyroid may be making too much hormone, so your brain reduces the signal. This often points to an overactive thyroid.

Your doctor may also ask for Free T4, Free T3 or thyroid antibody tests to understand the results better and look for possible causes.

The TSH test is a simple blood test. You usually do not need to fast for TSH alone, unless you are also having other tests that require fasting.

But what counts as “normal” is not the same at every stage of a woman’s life.

TSH levels can vary with age, pregnancy and other changes in the body. There is no single range that suits every woman. Your doctor will read your result based on your age, symptoms, health and stage of life.

Age can also affect TSH levels, and levels may rise as people get older. Different labs may use slightly different ranges because they use different testing methods.

Always check the normal range printed on your report. A result outside that range does not automatically mean you need treatment. Your doctor will look at the full picture before deciding what to do.

So what does it mean when your number sits outside the range?

Your TSH result can give your doctor an idea of whether your thyroid is working too slowly or too quickly. However, the number alone cannot tell the whole story.

What does high TSH mean?

A high TSH level often points to an underactive thyroid, also called hypothyroidism. This means your thyroid may not be making enough hormone.

Possible signs include:

• Feeling tired even after resting
• Gaining weight without a clear reason
• Dry skin or thinning hair
• Constipation
• Feeling colder than usual
• Low mood
• Heavy or irregular periods

What does low TSH mean?

A low TSH level often points to an overactive thyroid, also called hyperthyroidism. This means your thyroid may be making more hormone than your body needs.

Possible signs include:

• Losing weight without trying
• A fast or racing heartbeat
• Feeling anxious or restless
• Feeling too hot or sweating more than usual
• Shaking hands
• Lighter or missed periods

Sometimes, TSH is outside the normal range while T3 and T4 remain normal. This is called subclinical thyroid disease. Your doctor may repeat the test and consider your symptoms, pregnancy plans and thyroid antibody results before suggesting treatment.

One unusual result does not confirm a thyroid problem. Some illnesses, medicines and supplements, including biotin, can affect test results. Your doctor may ask you to repeat the test.

If treatment is needed, it is often manageable with medicine and regular blood tests. For an underactive thyroid, daily tablets are commonly used, with the dose adjusted when needed.

And this isn't a rare issue for women in India.

Thyroid problems are common in India, and women are more likely than men to have an underactive thyroid.

A study of adults in eight Indian cities found that 15.86% of women in the study had hypothyroidism, compared with 5.02% of men. These figures describe the people included in that study and should not be taken as the exact rate for every woman in India.

Thyroid health is especially important during pregnancy. An Indian study across 11 cities and nine states found hypothyroidism in 13.13% of 2,599 pregnant women studied, with most cases being mild. The study suggested that testing all pregnant women may be helpful.

Thyroid problems that are not found and treated when needed can affect periods, fertility, pregnancy, a baby's growth and development, cholesterol levels and mood. Finding a problem early helps your doctor decide whether treatment or follow-up is needed.

You may need to discuss a TSH test with your doctor if you:

• Are planning a pregnancy or are already pregnant.
• Have irregular periods or trouble becoming pregnant.
• Have a family history of thyroid problems.
• Have an autoimmune condition, such as type 1 diabetes.
• Feel unusually tired or notice unexplained weight changes.

Your doctor can advise whether testing is right for you. Asking for a thyroid test is not overreacting. It is a reasonable step when you have concerns about your health.

So how do you get tested, and what should you do with the result?

Getting a TSH test is simple. Here are a few things to keep in mind before and after the test.

Before the test

• Fasting: You usually do not need to fast for a TSH test alone.
• Medicines and supplements: Tell the lab and your doctor about the medicines and supplements you take, especially thyroid medicine and biotin.
• Thyroid medicine: If you take levothyroxine, ask your doctor whether you should take it before or after your blood test.
• Test timing: Having the test at a similar time of day and using the same lab can make it easier to compare results over time.

After you receive your report

Do not try to diagnose yourself using online numbers. Take your report to your doctor and ask:

• Is my TSH level normal for my age and stage of life?
• Do I need a free T4 or thyroid antibody test?
• Should I repeat the test? If yes, when?
• Do I need treatment or just regular checks?

If you are taking thyroid medicine, your doctor may ask you to repeat the test a few weeks after changing the dose. Once your levels are stable, you may need tests from time to time.

The most important thing is to understand your result with the help of your doctor rather than worry about a single number.

If you are looking for a nearby place to get tested, Indian Scan can help.

Indian Scan is a diagnostic and lab centre in West Tambaram, offering blood tests and health check-up packages. You can get a TSH test and ask about combining it with other tests, such as a lipid profile, in one visit. Your doctor can help you choose the tests you need.

To book your test or ask about available packages, call 8233 433 533.

Disclaimer: This article is for general educational purposes and is not a substitute for professional medical advice, diagnosis or treatment. Thyroid ranges vary by lab and stage of life. Consult your doctor before starting or changing any thyroid medicine.