What are the symptoms of subclinical hyperthyroidism?

What are the symptoms?

  • Frequent bowel movements.
  • Fatigue or feeling tired.
  • Feeling nervous.
  • Unable to tolerate heat.
  • Increased sweating.
  • Increased appetite.
  • Racing or rapidly beating heart.
  • Losing weight without trying.

What is the most common cause of subclinical hyperthyroidism?

Subclinical hyperthyroidism refers to a mildly overactive thyroid and is defined as a low TSH (thyroid stimulating hormone) and a normal free thyroxine (FT4). The two most common causes of subclinical hyperthyroidism are Graves’ disease and one or more overactive nodules in the thyroid (toxic nodular goiter).

Is subclinical hyperthyroidism serious?

Subclinical hyperthyroidism is associated with an increased risk of atrial fibrillation and heart failure in older adults, increased cardiovascular and all-cause mortality, and decreased bone mineral density and increased bone fracture risk in postmenopausal women.

How is subclinical hyperthyroidism treated?

Your doctor will likely prescribe radioactive iodine therapy or anti-thyroid medications, such as methimazole. Radioactive iodine therapy and anti-thyroid medications can also be used to treat subclinical hyperthyroidism due to multinodular goiter or thyroid adenoma.

Can subclinical hypothyroidism cause symptoms?

Subclinical hypothyroidism most of the times has no symptoms. This is especially true when TSH levels are only mildly elevated. When symptoms do arise, however, they tend to be vague and general and include: depression.

Can subclinical hyperthyroidism turn into hyperthyroidism?

Some studies have suggested that patients with subclinical hyperthyroidism may develop overt hyperthyroidism at a rate of 1% to 5% per year (Sawin 1994; Sundbeck 1991). However, some other studies have suggested that patients with subclinical hyperthyroidism revert to normal after diagnosis (Parle 1991; Rosario 2010).

What is considered hyperthyroidism TSH level?

A low TSH level—below 0.5 mU/L—indicates an overactive thyroid, also known as hyperthyroidism. This means your body is producing an excess amount of thyroid hormone. What causes high TSH levels? A high TSH level—above 5.0 mU/L—indicates an underactive thyroid, also known as hypothyroidism.

What if my TSH is normal but I still have symptoms?

Some people treated for hypothyroidism may still experience symptoms even if blood tests show that their thyroid stimulating hormone (TSH) levels are well within the normal range.

Does subclinical hyperthyroidism require treatment?

In contrast, subclinical hyperthyroidism caused by nodular hyperthyroidism usually requires ablative treatment because spontaneous normalization of thyroid function in this condition seldom occurs. Thus, surgery or administration of radioactive iodine is the treatment of choice in such cases.

What if my T3 and T4 are normal but TSH is high?

When the thyroid gland becomes inefficient such as in early hypothyroidism, the TSH becomes elevated even though the T4 and T3 may still be within the “normal” range.

What TSH level is considered subclinical hypothyroidism?

Subclinical hypothyroidism is defined as a thyroid stimulating hormone (TSH) level of 4.6 to 10 mIU/L. A normal TSH level is 0.4 to 4.0 and full-blown hypothyroidism is 10 or higher.

Is TSH level of 4.7 normal?

The typical range of reference for TSH levels is anywhere between 0.45 and 4.5 milliunits per liter (mU/L) . A recent study suggests that the normal range should be more like 0.45 to 4.12 mU/L. TSH can vary wildly based on your age, sex, and stage of life.

Is TSH 4.5 high?

Most labs say that a normal serum TSH level is somewhere between 0.4 to 4.0 mIU/L, and that a TSH level of 10 mIU/L or higher is indicative of hypothyroidism. A TSH level of 4.5 to 10 mIU/L is considered indicative of subclinical hypothyroidism.

Is TSH level 7 high?

According to Cappola, her research regarded mildly elevated TSH levels as those in the 4.5 to 7 mU/L range, while very elevated TSH levels were considered to be those greater than 20 mU/L.

Can your TSH be normal and still have thyroid problems?

Yes, it is possible to have hypothyroidism and normal TSH levels in the blood. Most people with hypothyroidism have high TSH because their thyroid gland is not releasing enough hormones. In response to this, the body produces more TSH in order to get the thyroid to work.

What is a good TSH level for a woman?

TSH normal values are 0.5 to 5.0 mIU/L. Pregnancy, a history of thyroid cancer, history of pituitary gland disease, and older age are some situations when TSH is optimally maintained in different range as guided by an endocrinologist. FT4 normal values are 0.7 to 1.9ng/dL.

What are the symptoms of thyroid problems in females?


  • Fatigue.
  • Increased sensitivity to cold.
  • Constipation.
  • Dry skin.
  • Weight gain.
  • Puffy face.
  • Hoarseness.
  • Muscle weakness.

What happens if TSH is high in female?

High TSH levels can mean your thyroid is not making enough thyroid hormones, a condition called hypothyroidism. Low TSH levels can mean your thyroid is making too much of the hormones, a condition called hyperthyroidism. A TSH test does not explain why TSH levels are too high or too low.

What does it mean if TSH is high but T4 is normal?

A normal TSH and normal T4 show a normal thyroid. A low TSH and high T4 generally means an overactive thyroid. A high TSH and low T4 means an underactive thyroid. A low TSH and low T4 mean low thyroid function because of another problem, such as with the pituitary gland or hypothalamus of the brain.

Do thyroid problems always show up in blood tests?

A blood test measuring your hormone levels is the only accurate way to find out whether there’s a problem. The test, called a thyroid function test, looks at levels of thyroid-stimulating hormone (TSH) and thyroxine (T4) in the blood.

Can thyroid problems affect your breathing?

Severe low thyroid can weaken the muscles that help you breathe. Some experts think this is why hypothyroidism can lead to pauses in your breathing while you sleep, a condition called sleep apnea.

What if my T3 and T4 are normal but TSH is low?

A low TSH with normal free T4 and T3 levels is consistent with subclinical hyperthyroidism. Some patients with nodular goiter and Graves’ disease, particularly early in the disease course, will have predominant elevations in T3 due to increased conversion of T4 to T3 and a disproportionate increase in T3 secretion.

What are the symptoms of a suppressed thyroid?

When something other than the pituitary gland causes excess thyroid hormone production, TSH levels will drop.
The conditions associated with low TSH levels produce a lot of symptoms, including:

  • Weight loss.
  • Sleep issues.
  • Bulging eyes.
  • Light sensitivity.
  • Fatigue.
  • Irregular menstrual cycles.
  • Confusion.
  • Lack of heat tolerance.

Does low TSH always mean hyperthyroidism?

A TSH level lower than normal indicates there is usually more than enough thyroid hormone in the body and may indicate hyperthyroidism. When hyperthyroidism develops, free thyroxine (T4) and free triiodothyronine (T3) levels rise above normal. Other laboratory studies may help identify the cause of hyperthyroidism.