Goiter is a disease of the thyroid gland, an endocrine gland located in the front, lower part of the neck, pressing on the sides of the larynx and the first rings of the trachea.

Normally, the thyroid gland produces hormones T3 (triiodothyronine) and T4 (levothyroxine) that regulate the body's metabolic processes. When the thyroid gland produces too much hormone, it leads to hyperthyroidism. When hyperthyroidism occurs, the patient will have symptoms such as: hand tremors, rapid heartbeat, high blood pressure, sweating, weight loss, fatigue...

Hyperthyroidism is a syndrome caused by overproduction of thyroid hormones. Hyperthyroidism is now common with symptoms similar to many other diseases.