Long time not washing hair scalp pain may be caused by seborrheic dermatitis, scalp folliculitis, scalp sensitivity and other reasons. 1. seborrheic dermatitis: long time not washing hair will lead to scalp area sebaceous gland secretion, oil accumulation in the scalp, dandruff increase, itching situation, too long will be secondary infection scalp pain symptoms. 2. Scalp folliculitis: long time not washing hair caused by local dirt accumulation, breeding bacteria, local bacteria blocked hair follicles affect the normal follicle metabolism triggered scalp folliculitis, scalp pain. 3. Scalp sensitivity: a long time without washing the hair is prone to breeding bacteria, scalp nerves are stimulated by bad, thus causing scalp sensitivity, scalp pain, feeling abnormal and so on. It is recommended to develop good daily habits, wash your hair, take a bath and pay attention to personal hygiene. If the scalp pain persists and cannot be relieved, you should go to the hospital in time and be treated under the guidance of the doctor.