Increased and itchy premenstrual discharge may be caused by non-pathological reasons, such as normal phenomenon before menstruation, improper cleaning, etc. It may also be caused by pathological reasons, such as vaginitis. If a woman has increased premenstrual discharge and itching, along with other uncomfortable symptoms, it is recommended that she go to the hospital in time to get treatment under the guidance of a doctor for clear reasons. I. Non-pathological causes: 1. Normal phenomenon before menstruation: the perineum is more humid before menstruation, coupled with the poor permeability of the underwear, may cause irritation to the pubic skin, causing pubic itching, discharge, etc. If the menstrual flow can be relieved on its own, it is generally a physiological change and does not require special treatment; 2. Improper cleaning: if you do not change and wash your underwear in time and do not pay attention to hygiene, the local area may If you do not change your underwear in time and do not pay attention to hygiene, the local area may breed bacteria, which may cause increased discharge and itching before menstruation, but no other uncomfortable symptoms, it is recommended that you change your underwear regularly, drink more water, keep the perineum clean and dry, and usually the symptoms can gradually improve. Pathological causes: Pseudomonas vulvae and trichomonas vaginitis cause increased discharge and itching before menstruation, and before menstruation is the time period when Pseudomonas vulvae is prone to recurrence. It is necessary to keep the perineum clean, change the sanitary napkin on time, and use clotrimazole pessary for treatment under the guidance of doctor after the end of menstruation.