My mother aged 44 is suffering from hyperthyroidism but sometimes her tsh levels come tonormal...should she continue the use of medicine.or what?

See your doctor: Your sister needs to see a doctor to find out why she is having these problems. She should see one soon.

Few reasons: There are a few reasons why your mom could be hyperthyroid. This could be due to a nodule that is over-producing hormone, graves' disease, or hashimoto's thyroiditis. Of these, i favor the last one, as this can cause some fluctuations in the thyroid hormone levels. I would recommend that she see an endocrinologist who can do the correct blood tests to make the diagnosis, then set up treatment.