If the vagina is painful and itchy, the most common clinical causes are: 1. Pseudomonas vulvae caused by Candida, which not only causes pain and itchiness in the vagina, but also causes redness and swelling of the vulva and a large amount of tofu-like discharge in the vagina, some people also have bladder irritation symptoms such as frequent and urgent urination. This can be treated by douching with 5% sodium bicarbonate and inserting dacrynic acid capsules into the vagina. 2. Trichomoniasis is caused by trichomonas infection, which results in a large amount of yellow foamy discharge in the vagina and causes allergic reactions, resulting in localized itching.