Alopecia is caused due to various reasons as it is an autoimmune disease. The function of immune system is to protect the body against some infections and ailments and in this sort of disease the immune system erroneously attacks some part of your own body. In the case of patient suffering from Alopecia the immune system has attacked the hair follicles. The exact cause of this disorder is still not known but scientists however believe that genes play a definite role and in some cases it has been evidently proven as a genetic disorder. A virus in the environment can also be a major cause of this sort of disease to originate and get triggered in later stages. Chemotherapy and emotional stress also plays a very vital role in promoting this disorder.