The methods of hair loss examination include: 1, hair pulling test: the patient is usually asked to pull the hair gently by hand without washing the hair for 3-5 days, if the hair is gently pulled down more than 6, the hair pulling test is positive. It proves that it is anagen hair loss and proves that the patient’s hair loss is active; 2. Hair microscopy: Hair microscopy can determine the thinning degree of the patient’s hair by examining the hair follicles and hair trunk, based on the examination of their density. At the same time, you can see some basic conditions around the hair follicle, such as whether there is more oil around the hair follicle; in addition to these two conventional examination methods certain systemic diseases such as hyperthyroidism, sex hormones, trace elements can also be used as hair loss examination methods.