Autoimmune :
Alopecia areata is an autoimmune disease. Autoimmune means that the body’s immune system attacks the body. The body attacks its own hair follicles when alopecia areata develops. A person’s genetic makeup, fuse with other factors, triggers this form of hair loss. Hormones, such as abnormal levels of androgens male hormones normally produced by both men and women.
Genes :
The male and female parents may influence a person’s predisposition to male or female pattern baldness.
Stress, sickness, and childbirth can cause temporary hair loss. fungal infection such as Ringworm it also causes hair loss.
Temporary hair loss is also caused by Burns, injuries, and X-rays. In such cases, hair growth normally returns once when the injury is healed some of Drugs, such as chemotherapy drugs used for cancer treatment, blood thinners, beta-adrenergic blockers used to control blood pressure and birth control pills it also cause temporary hair loss.
Cosmetic procedures, such as shampooing too often, perms, bleaching and dyeing hair are the main factor to overall hair thinning by making hair weak and brittle.
Medical Conditions :
Thyroid disease, lupus, diabetes, iron deficiency, and anemia can cause hair loss, but when the underlying condition is treated the hair will return.
Diet:
A low-protein diet or seriously calorie-restricted diet can also cause temporary hair loss.