The question "why does hair fall out" refers to the loss of hair from the scalp or other parts of the body. It is a common issue that can affect people of all ages, and it can be caused by a variety of factors, including genetics, hormones, medications, and underlying medical conditions. For example, hair loss is a common side effect of chemotherapy, a treatment for cancer.
Understanding the reasons behind hair loss is important for a number of reasons. First, it can help to identify and treat any underlying medical conditions that may be causing the hair loss. Second, it can help to develop effective treatments for hair loss. Third, it can help to reduce the psychological distress that can be associated with hair loss.