The patient’s legs itch badly at night, indicating that there is no itching or lighter itching during the day. On the one hand, it may be related to the fact that there is no contact with disease-causing factors during the day and only at night, for example, there are mites in the bed where the patient sleeps at night and the patient is allergic to mites; on the other hand, it may be that the patient is highly concentrated during the day at work and study and has no time to take care of the leg itching, while the body relaxes at night and the attention is The leg itch is attracted, so the itch is felt to be more powerful at night. Patients are advised to visit the dermatology department of the hospital if necessary, and to carry out symptomatic treatment for the cause as well as after the doctor’s examination. A, not accompanied by lesions: 1, dry eczema: that is, lack of lipid eczema, mainly manifested as dry skin, can be fine cracks, accompanied by itching, scratching can appear a small amount of flaking, patients may be in the evening after bathing due to hot water or alkaline body wash stimulation, more serious itching; 2, limited pruritus: patients thigh skin is generally no other primary lesions, the main symptom that is itching, possible disease Because of dry skin, anxiety and systemic diseases, such as diabetes, liver and gallbladder disease, dry syndrome, etc. Second, accompanied by skin lesions: 1, urticaria: If the patient’s legs are not abnormal at the beginning, when the itching is accompanied by skin wind mass, and the skin does not leave any trace after the wind mass subsides, consider the urticaria caused by allergies, such as the patient sleeps at night with mites or bedding quality is not qualified, etc.; 2, other skin diseases: clinically there are very many diseases that lead to serious itching of the legs at night, especially itching accompanied by skin lesions Diseases, such as various dermatitis, psoriasis, dermatophytosis and so on, at this time the lesions are generally not easy to fade, usually accompanied by flaking, exudation, erythema and other skin manifestations.