Can stress cause hair to thin at the temples? i feel like i have chronic stress

Stress vs hair loss: Stress is one of a number of causes of hair loss. Infection, thyroid disorder, malnutrition, etc, can also cause hair loss. Some autoimmune conditions, too - think of these as military phrase, friendly fire, in which your body fights itself. Don't forget excess dihydrotestosterone & genes (family history). See http://www.mayoclinic.org/diseases-conditions/hair-loss/basics/definition/con-20027666