The severity of hair loss is usually judged by the amount of hair loss and the area of hair loss in a short period of time. Hair loss is generally categorized into seven levels, as follows. It is not recommended to judge by yourself, you need to go to the hospital and be judged by a professional doctor according to the actual situation. 1. Grade 1 hair loss: the front hairline is normal, and the amount of hair loss in a day is not more than one hundred for grade 1 hair loss. 2. Grade 2 Alopecia: the front hairline is slightly shifted back and the forehead looks bigger. 3. Grade 3 Alopecia: the front hairline moves back significantly. 4. Grade 4 hair loss: Baldness is obvious at the front hairline, and the hair on the top of the head is thinner, but has not completely fallen out. 5. Grade 5 hair loss: the overall loss of hair at the front hairline and the hair on the top of the head is more obvious, and the area of hair loss is large. 6. Grade 6 hair loss: the hair in the front hairline is basically lost, and the trend of hair loss spreads significantly from the top of the head to the back. 7. Grade 7 alopecia: It is the most serious hair loss, with the overall hair left only in the back of the occipital area and the surrounding circle. Patients with serious hair loss problems are advised to seek timely medical treatment.