The TSH (Thyroid Stimulating Hormone) test measures the level of thyroid-stimulating hormone in your blood, which plays a crucial role in regulating your thyroid gland's function. A properly functioning thyroid is vital for maintaining your metabolism, energy levels, and overall health. Abnormal TSH levels can indicate an underactive (hypothyroidism) or overactive (hyperthyroidism) thyroid, leading to symptoms such as fatigue, weight changes, and mood swings. This simple blood test can help identify thyroid disorders and guide necessary treatment or lifestyle adjustments, making it an essential step in understanding your hormonal health.