The thyroid is a gland in the body which produces two hormones T3 and T4. Pituitary is another gland which is the master gland of the body which secretes thyroid stimulating hormone which stimulate the thyroid to release T3 and T4. If the thyroid is functioning excessively T3 and T4 increases in the body and pituitary gets a message. So the TSH is secreted less and thyroid is less stimulated and T3, T4 levels come back to normal. The condition where T# T4 is elevated and TSH is less is called hyperthyroidism. Normal TSH levels varies from 0.3 to 4.2. There are some kits which quote as 0.3 to 5.2 as normal. If the value is between this we find that thyroid is not having any major issue. Patient should not be treated with any medicine at that point. If the TSH values less than 2 or 1.5 most of them later on in life will turn to hypothyroid subjects. Suppose TSH is low for a longer time there is less stimulation of thyroid and these people gradually can have hypothyroidism. In this condition the patient should not take any medication but should take care of the diet. You should be aware of the goitrogenic foods. Cabbage, cauliflower, broccoli, processed and preserved food and refined sugar are known to be not good for the thyroid gland. Cranberry and salt containg foods are very effective in hyperthyroidism. Certain homeo medicines like throidinum, calcaria iode, sulphur iode, naturum iode are found to be very effective in thyroid functions. Iodium and spongia are other two major medicines used in the function of thyroid gland. Even by examining the hair we can tell whether this person has got a thyroid problem or not.