Reversible or permanent hair loss?

There are several types of hair loss. Dermatologists often classify it into temporary (reversible) or permanent (irreversible) hair loss. Reversible hair loss is primarily caused by severe infections, prolonged stress, dieting, inadequate nutrition, severe infections, side effects of medication and improper hair care. Internal factors which may also be involved in hair loss are hormonal changes related to pregnancy and deficiencies in the function of the immune system. Irreversible hair loss usually results from a gradual reduction in the number of hair follicles, from permanent weakening of activity of hair follicles, or from different skin diseases.