what is the causes of hair loss?

what is the causes of hair loss?
There are many causes and factors that lead to hair loss for both men and women

 

(Physical stress – Pregnancy – Too much vitamin A – Lack of protein – Male pattern baldness – Heredity- Emotional stress – Anemia – Hypothyroidism – Vitamin B deficiency – Autoimmune-related hair loss – Dramatic weight loss – Chemotherapy – Overstyling – Trichotillomania – Aging – Anabolic steroids).