Soft and fine hair loss may be caused by physiological factors such as heredity, or by diseases such as ringworm and androgenetic alopecia. 1. Physiological factors: If the parents have soft and fine hair, it will be passed on to the children, making the children’s hair become soft and fine. It is a physiological phenomenon for normal people to lose 50-100 hairs per day. 2. Ringworm: It is mainly caused by ringworm infection, which can be spread through direct contact, indirect contact and other ways of infection, and the patient will have symptoms such as thinning hair, soft hair, easy to bend, easy to break, and fall off. 3. Androgenetic alopecia: It is mainly caused by heredity, androgen metabolite dihydrotestosterone and other factors, which will lead to hair thinning, softening, hair thinning and other symptoms. People with soft and thin hair are advised to consult a doctor in time to find out the cause of the disease after physiological factors are ruled out.