There are many reasons for vaginal swelling, mainly including allergy, vaginal inflammation, trauma, cervical cancer, Bartholin’s gland cyst or abscess. 1. Allergy: Some allergic people who are allergic to condoms and vaginal medications will show vaginal swelling and may also have vaginal itching, tingling and increased leucorrhea. If the allergy is to condoms, it is recommended to change to another form of contraception. If it is caused by allergy to vaginal medication, it is recommended to stop the medication as prescribed by the doctor and use vaginal douche to expel the residual medication. If the allergy is serious, anti-allergy medication can be applied. 2. Vaginal inflammation: The most common one is vaginitis. The vaginal infection is caused by various pathogens, which will stimulate the vaginal wall and cause the vaginal mucosa to become congested and edematous. It may also be accompanied by itching, burning sensation and changes in the color and nature of vaginal discharge, such as tofu sludge-like or foamy. 3. Trauma: If the vagina is traumatized, such as accidentally bumping into the local area, or tearing the vagina due to excessive force during childbirth, or damage to the vaginal wall due to excessive force during sex, the vagina may become swollen. It is necessary to choose the corresponding treatment according to the specific conditions of individuals. If it is accompanied by strong pain, it is recommended to seek medical treatment in time; 4. Cervical cancer: if there are local masses and pressure, which cause vaginal swelling due to obstruction of reflux, accompanied by vaginal bleeding with foul smell, cervical cytology, HPV, cervical biopsy and serum tumor marker examination should be done to confirm the diagnosis, and the treatment can choose chemotherapy drugs or surgery Such as cervical conization, total hysterectomy, etc.; 5. Other diseases: such as Bartholin’s gland cyst or abscess, which can also cause swelling of the vaginal opening and require surgical treatment if necessary.