Cause of hair loss: In men, hair loss starts from the forehead hairline and thinning of the hair occurs in the crown area. The forehead line and temples are pulled back over time, and it progresses towards complete hair loss from the crown area. The onset, speed and end point of hair loss, the severity of which increases with age, varies genetically. In other words, when the shedding will start and how much shedding will occur, it will fit the pattern of shedding in your family. Although the cause of hair loss is attributed to a clear genetic transition, hair loss can also be triggered by factors such as diseases, medications, nutritional disorders, general anesthesia, fast diets and psychological stress. For example, hair loss ; Anemia can be a symptom of endocrine disorders such as diabetes or thyroid.