There are many causes of sudden baldness, such as excessive mental stress and immune dysfunction, which can cause it. Hair loss is a very common disease in life and can include many diseases, such as seborrheic alopecia and baldness. Baldness hair is shed in patches and can basically be considered to be caused by baldness based on clinical manifestations. In addition to the common causes, there are some less common causes that are easily overlooked, such as thyroid disorders that may be related to baldness. Therefore, when diagnosing and treating baldness, the possibility of disease causing baldness must be taken into consideration.