The commonest cause for hair loss is iron deficiency anemia followed by folic acid deficiency. Since u have hypothyroidism with TSH of 4.5 which is normal but not under control. Ideally it should be between 1-2 if u have symptoms suggestive of hypothyroidism after ruling out other causes. Check Anti-TPO antibody too. If it is positive then u should consult a physician or Rheumatologist to rule out other causes of excessive hair loss. Autoimmune hypothyroidism is associated with many other autoimmune diseases. Consult a physician to find out cause for excess hair loss and its link with other problems.

Hello..4.5 tsh is normal.. You continue taking thyronom 100mcg..Have you checked thyroid peroxidase antibody?? Kindly consult your physician if hair loss is bothering. You need to do a few blood investigations.

Please share the reference normal of the lab you've taken test from to help to comment.Repeat after 6 weeks the trend will help to decide. Wish you good health.