Itchy back of the head may be related to head lice, ringworm, eczema and so on. 1. Head lice: head lice will inject saliva into the human body when they bite the scalp, causing an allergic reaction, thus causing scalp itching. If head lice happen to parasitize the back of the head and bite the back of the head, it will cause itching at the back of the head. 2. Ringworm: It may be that the patient himself has ringworm or contact with pets suffering from ringworm, causing the scalp and hair to be infected with ringworm bacteria. When it involves the back of the head, itching will occur and may be accompanied by scaling and other symptoms. 3. Eczema: Eczema is triggered by the patient’s recent consumption of or contact with allergy-prone substances or recent mental stress. When eczema occurs on the back of the head, pimples may appear, accompanied by itching. Itchy back of the head can also be seen in other causes, it is recommended to consult a doctor in a timely manner, follow the doctor’s instructions to carry out relevant examinations, with the help of the doctor to clarify the cause, and targeted treatment or treatment.