Poor circulation in your scalp can cause hair loss.

This is true and false. The scalp generally has very good circulation, so it is rare to have poor circulation causing hair loss. However, even though the general scalp has a very good circulation, the tiny blood vessel that feeds each individual hair follicle involutes as the follicles miniaturizes. So in this sense, is it the fact that the vascular supply decreased first prior to the miniaturization or just that the miniaturized follicle is associated with a miniaturized vascular supply? Another exception to this good scalp vascular supply is a scar on the scalp. Scars typically have poor blood supply and can make it difficult for even transplanted hair to grow.