The left side of the woman inside the lower vagina hidden pain, consider and poor hygiene habits, folliculitis, vestibular cysts and other factors related. 1. Poor hygiene habits: usually do not pay attention to personal hygiene, the use of substandard hygiene products, household products, the local cause adverse stimulation, can cause pain. 2. Folliculitis: local high temperature, humidity, hair follicle blockage triggers inflammation, resulting in localized pain. 3. Vestibular gland cysts: Vestibular gland cysts, also known as Bartholin’s gland cysts, are localized cysts caused by the blockage of glandular ducts that prevent the discharge of glandular fluids. Patients mainly manifested as vulvar lumps, localized swelling, pain and so on. It is recommended to pay attention to personal hygiene, and go to the gynecology department of the hospital for relevant examinations to make a clear diagnosis.