Baldness, or alopecia, a partial or complete loss of hair, primarily affecting the scalp. Baldness may spread over the entire head, or it may occur only in spots. Known causes of baldness include hereditary factors, aging, diseases affecting the entire body, scalp disorders, ionizing radiation, and reaction to drugs. Gradual loss of hair may be caused by malnutrition, disorders of the endocrine system, drug poisoning, and other diseases. Several diseases, particularly those characterized by prolonged high fevers, may cause baldness. Typhoid fever or scarlet fever can cause sudden loss of hair from the head or entire body. Gradual loss of hair may be caused by malnutrition, disorders of the endocrine system, drug poisoning, and other diseases. Alopecia universalis causes a permanent and total loss of hair over the entire body including the eyebrows and eyelashes. The cause of alopecia universalis is unknown.

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1) Alopecia areata

 

 

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