What does abnormal thyroid stimulating hormone (TSH) level mean?

What does abnormal thyroid stimulating hormone (TSH) level mean? If you have symptoms such as hair loss, fatigue, weight gain, constipation, cold intolerance, etc., then you could be having high TSH levels. Thyroid panel at Labwork consists of all tests to analyse the health and functioning of the thyroid gland. High TSH levels mean low thyroid function, and vice versa.