Thyroid problems occur when a defect in the thyroid gland either causes increased or decreased production of the thyroid hormones.
When the thyroid makes too much thyroid hormones, it is called Hyperthyroidism. Symptoms include- extreme tiredness, palpitations, anxiety, unexplainable weight loss, sleeping troubles, heat intolerance, sweating, irritability, irregular periods.
When the thyroid gland does not make enough hormones, it is called Hypothyroidism. Symptoms of hypothyroidism are unexplainable weight gain, cold intolerance, hair loss, constipation, fatigue and dry skin, irregular periods.