8 Thyroid Disorders and Their Common Symptoms

3. Hashimoto's Thyroiditis - The Autoimmune Attack on Your Thyroid

Hashimoto's thyroiditis, also known as chronic lymphocytic thyroiditis, represents the most common cause of hypothyroidism in developed countries and exemplifies how the body's immune system can mistakenly turn against its own tissues. This autoimmune condition occurs when the immune system produces antibodies that attack and gradually destroy thyroid tissue, leading to progressive thyroid dysfunction and eventual hormone deficiency. Named after Japanese physician Hakaru Hashimoto who first described it in 1912, this condition affects women approximately seven times more frequently than men and often has a genetic component, running in families alongside other autoimmune disorders. The symptoms of Hashimoto's thyroiditis typically mirror those of hypothyroidism but may fluctuate in severity as the autoimmune process waxes and wanes. Patients commonly experience fatigue, weight gain, cold sensitivity, dry skin and hair, constipation, muscle aches, and depression, but these symptoms may vary in intensity over time. A distinctive feature of Hashimoto's is the potential for thyroid enlargement (goiter), which may cause a feeling of fullness in the neck, difficulty swallowing, or a visible swelling at the base of the throat. Some patients experience periods where symptoms temporarily worsen or improve as the inflammatory process affects different areas of the thyroid gland. The diagnosis is confirmed through blood tests showing elevated TSH, decreased free T4, and the presence of thyroid peroxidase (TPO) antibodies or thyroglobulin antibodies, which indicate the autoimmune nature of the condition.