Alopecia, the pathological hair loss, refers to a hair loss problem that is due to various causes such as age, illness, lifestyle, medication, and hereditary factors. Hair experts can assess the cause based on the progression of hair loss and when it occurred. For example, sudden hair loss is usually attributed to an illness, medical treatments (such as chemotherapy), or a change in diet. Gradual hair loss is more of a hereditary problem and is part of the normal aging process. This type of Alopecia is one of the most common hair loss problems and occurs to both men and women.