Overview

Hypothyroidism, also known as an underactive thyroid, is a condition in which the thyroid gland does not produce enough thyroid hormones to meet the body’s needs. These hormones play a vital role in regulating metabolism, energy levels, heart function, and body temperature. When hormone levels are low, many body processes slow down, leading to a wide range of symptoms.

Symptoms

Symptoms of hypothyroidism often develop gradually and may be subtle in the early stages.

Common symptoms include:

  • Persistent fatigue or low energy

  • Weight gain despite no change in appetite

  • Sensitivity to cold

  • Dry, coarse skin

  • Hair thinning or hair loss

  • Constipation

  • Depression or low mood

  • Memory or concentration problems

  • Slow heart rate

  • Menstrual irregularities or infertility

Causes

Hypothyroidism occurs when the thyroid gland is unable to produce sufficient hormones.

Common causes include:

  • Autoimmune disorders, especially Hashimoto’s thyroiditis

  • Iodine deficiency

  • Thyroid surgery or radiation therapy

  • Certain medications

  • Congenital absence or malfunction of the thyroid gland

  • Disorders of the pituitary gland

Risk Factors

Certain individuals are more likely to develop hypothyroidism.

Risk factors include:

  • Female sex

  • Increasing age

  • Family history of thyroid disease

  • Pregnancy or postpartum period

  • Autoimmune diseases

  • Iodine-deficient diet

  • Previous thyroid treatment

Complications

If untreated, hypothyroidism can lead to serious health complications.

Possible complications include:

  • Goiter

  • Heart disease

  • Peripheral nerve damage

  • Infertility

  • Birth defects during pregnancy

  • Myxedema, a rare but life-threatening condition

  • Mental health disorders such as depression

Prevention

Not all cases of hypothyroidism can be prevented, but early detection and proper management can reduce complications.

Preventive measures include:

  • Adequate iodine intake through diet

  • Regular thyroid function testing for high-risk individuals

  • Managing autoimmune conditions effectively

  • Adhering to prescribed thyroid hormone therapy

  • Regular medical follow-up

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