Severe hair loss in the fall mainly refers to seasonal hair loss, which is normal physiological hair loss, especially when the seasons are exchanged, mostly occurring in the fall and winter seasons, with the gradual adaptation of the climate, the amount of hair loss may be gradually reduced to normal hair loss. Seasonal alopecia is mainly due to the scalp in different seasons, with the fall, the weather gradually become cold, the temperature of the scalp will also be reduced, the microfilament vascular network at the scalp will be with the lowering of the temperature, and gradually contraction, which will affect the absorption of nutrients in the root of the hair, so that there is a lack of nutrient absorption of the hair, affecting the hair texture, the hair is dry, and prone to fall off. Generally seasonal hair loss is a physiological phenomenon and does not require special treatment. It is recommended that after the occurrence of seasonal alopecia, patients should reduce the number of hair washing, and at the same time, choose shampoos with good washing effect and low irritation, and do not use poor quality products.