Hypothyroidism is a condition in which the thyroid gland doesn’t produce enough thyroid hormone to keep some of the body’s functions running properly.

Overview and Symptoms

When the thyroid is underactive, or doesn’t produce enough hormone, the body slows down.

The main symptoms of hypothyroidism include:

  • feeling colder
  • fatigue/weakness
  • weight gain
  • coarse, dry hair
  • dry skin
  • forgetfulness
  • depression
  • constipation
  • memory loss

Because the symptoms are so variable and nonspecific, the only way to know for sure whether you have hypothyroidism is with a simple blood test.


Thyroid hormone medicine is a common treatment for hypothyroidism. In most cases, symptoms start to improve within the first week of starting treatment.