What Is Subclinical Hypothyroidism?

Subclinical hypothyroidism is fairly common, but the treatment is controversial. According to Vahab Fatourechi, MD, the prevalence of subclinical hypothyroidism increases with age and is higher in women. It has been linked with conditions such as elevated cholesterol levels and an increased risk for atheroclerosis . Atherosclerosis is a condition in which fatty materials collect along the walls of the arteries.

Identification

• Subclinical hypothyroidism is caused by insufficient production of thyroid hormone by the thyroid gland.

Symptoms

• Common symptoms of subclinical hypothyroidism include weight gain, excessive sleepiness, cold intolerance, fatigue, depression, dry or coarse hair, constipation, dry skin, swelling of the legs, decreased concentration, increased cholesterol levels, muscle cramps and vague aches and pains. However, it is not uncommon for people with subclinical hypothyroidism to experience no symptoms at all.

Causes

• The causes of subclinical hypothyroidism are autoimmune hypothyroid conditions like Hashimoto's disease, thyroiditis and the taking of lithium.

Diagnosis

• Thyroid-stimulating hormone (TSH) and thyroxine (T4) tests are performed by drawing blood in order to diagnose subclinical hypothyroidism.

Prevalence

• The prevalence of subclinical hypothyroidism in the adult population is 4 to 8.5 percent, according to the Mayo Clinic.