Physiologically during ovulation, some women experience this symptom due to the larger growth of the follicles during ovulation. In addition, if the egg is expelled, a small amount of follicular fluid will collect in the woman’s pelvic cavity, so the woman will feel a feeling of swelling in the anus. If this symptom does not occur during ovulation, it is important to consider that there is inflammation of the pelvis. Since the small stomach contains the woman’s uterus, fallopian tubes and ovaries, pain in the small stomach indicates possible inflammation of these organs. The anal swelling is usually due to inflammatory exudation inside the pelvic cavity, which can cause a sensation of anal swelling. So after this symptom occurs, it is best to go to the hospital to do vaginal ultrasound to see the pelvic condition of the woman and be able to make a clear diagnosis.