Hair loss. Alopecia can be inherited, related to shock or stress, dietary deficiencies such as malnutrition, genetic disorders, medication, and an autoimmune disorder in which the body's antibodies attack the hair follicles. Hormonal disorders can cause hairloss such as hypothryoidism. Exogenous trauma such as curling irons, constant pulling hairstyles (traction alopecia) and chemical trauma, e.g. Chlorine.
Many. Alopecia is the loss of hair. It can be of several varieties and degrees. It can be in small spots or secitons or can be generalized. Outside of pulling out ones hair, the natural shedding of hair (telium effluvium) and trauma, hair loss is usually from an immune source. The body reacts to the hair follicles and the quit producing hair. This sometimes can be treated and sometime not.