If you have thinning along the sides and back of your head as well as elsewhere (thinning on front and top), there is a condition we published called Diffuse Unpatterned Alopecia (DUPA) which requires a doctor to make the diagnosis with a hand microscope showing miniaturization in the sides and back of the head hair.This is a difficult problem to treat and people like you who have DUPA are not candidates for hair transplantation.