I had thelesimia major...i did bone marow transplant in 2006 now em having hair loss i didn't have thick hair my head is transperent.

It is not uncommon: For transplant patients to have change in hair quality and quantity. Some may go all the way back to the chemo prior to transplant. Talk to your care team about your concerns.

Complicated history: Thallassemia and drugs for immune suppression are possible causes, but there are other possibilities - you need evaluation of your full history for a diagnosis.