There are three phases that hair goes through. The first is the active growing phase which remains for two or more years. In this stage hair grows at a rate of 1-2 cm each month. The next is the resting phase which remains for three or more months. After that, some of the hair falls out.
Diabetes interferes with this process, slowing down the growth of the hair. When you have diabetes, you may lose more hair than normal. The hair loss is evident not only on the head, but also on the legs, arms and other body parts. Even if at all the hair grows back, the hair growth rate is slower than usual.