Itching of the vulva is often a symptom of many kinds of diseases, but sometimes the cause may not be found, but simply itching. The causes of vulvar itching can be broadly divided into local and systemic. A local cause: inflammation: trichomonas, mycobacteria, bacteria, chlamydia, mycoplasma, gonorrhea and other infections caused by vaginitis or cervicitis, the large amount of abnormal leucorrhea excreted stimulates the vulva, making the vulva itchy. Vulvar skin diseases: such as vulvar eczema, neurodermatitis, atrophic sclerosing moss, vulvar dermatitis, etc. These diseases can not only cause different degrees of itching, but also the vulvar skin may have different degrees of whitening, atrophy or thickening changes. Local irritation: If the vulva or vagina is rinsed with disinfectant solution, or certain drugs (such as sulfonamide, furacilin, chlorhexidine suppositories, etc.) are placed in the vagina, causing skin allergy or dermatitis in the vulva. Not paying attention to cleanliness during menstruation, or using rubber or plastic menstrual bands, and failing to wash the vulva from time to time, resulting in the accumulation of menstrual blood or vaginal secretions in the vulva for a long time. Or usually wear chemical fiber underwear, so that the vulva is often in a wet and hot environment, which can often cause vulvar itching. Washing the vulva with strong alkaline soap or hot water often leads to dry vulvar skin, lack of oil and itchiness. People with pinworm disease, pinworms often crawl out of the anus and stimulate the perianal and vulva, and cause itching, especially at night, and even affect sleep. Second, certain systemic diseases can also cause vulvar itching: 1, the most common is diabetes, due to the discharge of urine with sugar from time to time, stimulating the vulva, the vulva will be itchy, if the complication of mycobacterial infection will be more itchy. 2. When suffering from jaundiced hepatitis, riboflavin deficiency, anemia or chronic hepatitis, the whole body itches and the vulva also itches. 3, excessive fatigue, mental trauma or conditioned reflexes and other reasons: sometimes vulvar itching can not find obvious local or systemic causes, the vulva can not see any changes, this can not find the cause of vulvar itching, most likely caused by high mental tension, mental trauma or conditioned reflexes and other reasons.