TSH, or Thyroid-Stimulating Hormone, is a hormone produced by the pituitary gland in the brain. Its primary role is to regulate the production of hormones by the thyroid gland, which is located in the neck. These thyroid hormones, including thyroxine (T4) and triiodothyronine (T3), are essential for controlling metabolism, energy levels, and overall growth and development in the body. The levels of TSH in the blood can indicate how well the thyroid is functioning. High levels of TSH may suggest an underactive thyroid, known as hypothyroidism, while low levels can indicate an overactive thyroid, or hyperthyroidism. Monitoring TSH levels is crucial for diagnosing and managing thyroid-related disorders.