When people come into my office feeling tired all the time, gaining weight without eating more, or having trouble thinking clearly, one of the first things I check is their thyroid.
The thyroid is a little gland in your neck, shaped like a butterfly. It sits low in the front of your neck, and even though it’s small, it has a big job. Your thyroid makes hormones that help control how your body uses energy. These hormones affect almost everything—how fast your heart beats, how warm or cold you feel, how your brain works, and even how your skin and hair look. When the thyroid works the right way, we hardly notice it. But when it goes off track, it can cause all kinds of problems.
Let’s say your thyroid gets sluggish. That means it doesn’t make enough hormones. We call that hypothyroidism. When that happens, your body slows down. You might gain weight, feel tired all day, feel cold when everyone else is fine, or even feel a little sad or down for no clear reason. Your skin might get dry, your hair might fall out, and your nails might break more easily. Some people also get constipated or notice their periods become heavier or come more often.
Now let’s look at the other side. What if your thyroid is overactive and makes too much hormone? That’s called hyperthyroidism. That can make your body run too fast. You might feel anxious, sweaty, shaky, or like your heart is racing even when you’re just sitting down. You might lose weight even though you’re eating just fine—or maybe even more than usual. It might be harder to sleep. Your hands might tremble. Some people also feel hot all the time and have more bowel movements than usual.
One big sign that something’s going on with your thyroid is swelling in the neck. This is called a goiter. Sometimes it’s the only sign of a thyroid problem. If you notice a bulge or lump in your neck, especially when you swallow, it’s time to see a doctor. We can do a simple exam and check to see if the thyroid is enlarged or if there are nodules—little bumps—on it.
Thyroid problems are more common in women, especially over the age of 60. But men can have them too. If thyroid issues run in your family, your chances go up. Some women notice thyroid problems after having a baby or around the time of menopause.
So how do we find out if your thyroid is the problem? It’s actually pretty easy. We do a blood test that checks your TSH—that’s the hormone from your brain that tells the thyroid what to do. If TSH is high, that usually means your thyroid is too slow (hypothyroid). If TSH is low, it usually means your thyroid is too fast (hyperthyroid). We also check the actual thyroid hormone levels to get a clearer picture.
There are different reasons your thyroid might not work right. The most common cause of a slow thyroid is Hashimoto’s disease. That’s when your own immune system mistakenly attacks your thyroid. It usually runs in families and happens slowly over time.
The most common cause of a fast thyroid is Graves’ disease, another problem with the immune system, but this time it pushes the thyroid to work too hard. People with Graves’ might also notice eye problems, like bulging eyes or vision changes.
There are other causes too. Some medications can affect your thyroid. Some people get temporary thyroid problems after having a baby or a virus. Others might have thyroid nodules or even thyroid cancer, though cancer is rare and usually not aggressive.
Now let’s talk about what can happen if thyroid problems aren’t treated. If your thyroid is too slow for too long, your cholesterol might go up, which raises your risk for heart disease and stroke. Your energy drops so much you may have trouble working or doing everyday tasks. In very serious cases, people can get extremely cold and confused and may even pass out. That’s called myxedema coma, and it’s life-threatening—but very rare.
If your thyroid is too fast for too long, your heart can suffer. You may develop an irregular heartbeat, also called atrial fibrillation, which raises your risk for stroke. You can lose weight, but not in a good way—it comes with feeling awful. Your bones can get thin and weak over time. So even though the symptoms seem different, both hypo- and hyperthyroidism can cause big problems if ignored.
Here’s the good news. Thyroid disorders are very treatable. For hypothyroidism, the fix is pretty simple: we give you a pill with thyroid hormone—usually levothyroxine—that you take every morning. It replaces what your thyroid isn’t making. Most people feel better in a few weeks, and once we find the right dose, you just stay on it and get checked once or twice a year.
For hyperthyroidism, treatment depends on the cause. One common option is radioactive iodine, which slowly shrinks and destroys the overactive thyroid. Sometimes we use antithyroid pills to slow the thyroid down. If those don’t work, we might recommend surgery to remove the thyroid. After that, people usually take thyroid hormone pills, just like someone with hypothyroidism.
And yes, thyroid problems can affect your appearance too. I’ve had patients who didn’t understand why they were losing hair, why their eyebrows were thinning, or why they were puffy and tired-looking. After starting thyroid treatment, they felt like themselves again. One patient told me, “Doc, I didn’t know how bad I felt until I started to feel better.”
Now let’s clear up a common worry—what if it’s cancer? Most thyroid nodules are not cancer. Only about 1 in 20 are. And even if it is thyroid cancer, it’s usually slow-growing and very treatable. We can do an ultrasound, sometimes a biopsy, and find out what’s going on.
So what should you do if you think your thyroid might be off? First, don’t guess. Don’t Google. Talk to your doctor. A simple blood test can give you answers. If something’s wrong, we’ll make a plan that works for you.
Also, keep an eye on your neck. Do the thyroid check at home—stand in front of a mirror, tilt your head back, take a sip of water, and watch your neck as you swallow. If you see a lump or bulge, tell your doctor.
Let me say this too: don’t ignore your symptoms. If you’re tired all the time, or gaining weight without a reason, or sweating and shaking for no reason, it’s not “just aging.” It could be your thyroid trying to get your attention.
To sum it up: your thyroid may be small, but it has a big job. When it’s working right, you feel like yourself. When it’s not, you feel off—and maybe not even sure why. But once we figure it out, there’s help. You can feel better. You can think more clearly. You can have your energy back. You can enjoy life again.
And that’s the real power of paying attention to your thyroid.