There are many causes of hair loss and the cause determines the treatment options. Many men and women have a hereditary form of hair loss called androgenetic alopecia and treatments are aimed at slowing and stopping the loss. Sudden hair loss is caused by a condition called telogen effluvium. Low iron stores, illness, stress, medications, trauma, surgery, pregnancy, or diet can cause this type of hair loss. Another type of hair loss is called alopecia areata, which causes little bald spots and is caused by an autoimmune condition. Hair loss can be emotionally devastating but it is helpful to know that there are treatments that can slow hair loss or restore the hair.