What are the symptoms of a low TSH level?

A low thyroid stimulating hormone (TSH) level can indicate hyperthyroidism, a condition in which the thyroid gland produces too much thyroid hormone. Symptoms of hyperthyroidism may include:

- Increased heart rate

- Anxiety

- Nervousness

- Insomnia

- Fatigue

- Increased appetite

- Weight loss

- Heat intolerance

- Sweating

- Menstrual irregularities

- Diarrhea

- Muscle weakness

- Thinning hair

- Brittle nails