Yellowish and very thin leukorrhea with a feeling of swelling in the vagina may be caused by vaginitis, and you need to go to the hospital for a routine leukorrhea test to clarify the type of vaginitis. Due to the characteristics of the anatomical organization of the female pubic area, when women have unclean sex or undergo examinations and surgeries via the vagina, they are susceptible to bacterial and viral infections, leading to the emergence of vaginitis. In addition, fluctuating estrogen levels and decreased immunity lead to an imbalance of vaginal flora, which can also trigger vaginitis. When a woman suffers from vaginitis, there will be an increase in vaginal discharge, changes in color and character, accompanied by symptoms such as vaginal redness, itching, pain, etc. In severe cases, there will be a small amount of bleeding from the vagina as well as signs of irritation of the urinary tract, such as frequent urination and painful urination. According to the different causes of infection, vaginitis can be divided into bacterial vaginosis, trichomonas vaginitis, mycosis vaginitis and atrophic vaginitis. Patients need to go through a routine leukorrhea test to clarify the type of vaginitis before treating the cause.