Stress is linked to hair loss and hair growth. Emotional and physical stress can both be a cause of hair loss. There is a particular condition called trichotillomania. These individuals try to pull their hair out from time to time and leave a bald patch on their head. Some of them do not even realise what they are up to while others consciously hide this tendency from other people. Such people need to undergo treatments such as therapy and medications.
Conditions affecting the immune system can cause hair loss. Alopecia areata is a condition that affects the body’s immune system in which the hair follicles are attacked. Other conditions which can lead to hair loss or hair thinning are diabetes and lupus.