Judge by your hairline, hair thickness, amount of hair loss, and bald spots. 1. Hairline: Observe whether the hairline in front of you moves backward, if so, androgenetic alopecia, frontal fibrous alopecia, and other disorders are possible. 2. Hair thickness: Observe whether the hair is thinning from thick to thin, if the hair is thinning, alopecia areata is possible, such as seborrheic alopecia. 3. Number of hair loss: You can count how many hairs fall out every day. Normal hair loss is 70 to 100 hairs per day, hair loss more than 100 hairs per day, and hair thinning is possible baldness, such as androgenetic alopecia. 4. Bald spots: the sudden appearance of one or more bald spots should also be considered to have the possibility of alopecia, such as baldness, ringworm, scarring alopecia and other diseases. You should work and rest reasonably every day, work and rest moderately, and also seek medical treatment in time if you have more serious hair loss.