Hair loss is a manifestation of metabolism. If there is no specific disease factor and a sudden large amount of hair loss, it will recover slowly after conditioning. If the hair loss is caused by disease, it may be difficult to recover. Hair has anagen phase, regression phase and resting phase. About 80% of hair in normal people is in anagen phase, and 70-100 hairs can be shed every day, while there is also an equal amount of hair regeneration. If a large amount of hair loss occurs suddenly, consider whether it is due to excessive mental stress or poor sleep. After conditioning, such as usually pay attention to rest, ensure regular routine, avoid staying up late, reduce mental stress, slowly hair loss will gradually recover. If the sudden large amount of hair loss caused by disease, such as seborrheic alopecia, can be manifested as a gradual atrophy of hair follicles, hair thinning and shallow, usually will not slowly recover, need to promptly go to the dermatology department, and actively carry out treatment, in order to avoid aggravation of the condition. Patients should usually pay attention to a balanced diet, eat more vegetables and fruits, appropriate supplementation of trace elements, pay attention to the combination of work and rest, do not often perm and dye hair, pay attention to hair cleaning and care, which can help relieve symptoms.