The pelvic and abdominal cavities are connected, with the pelvic cavity being below and the abdominal cavity being above. The pelvic and abdominal cavities are distributed differently in the body, with those in the pelvic bone position being called the pelvic cavity and those in the abdominal position being called the abdominal cavity. The pelvic cavity is the cavity inside the pelvis, where urinary organs such as the bladder and urethra and the uterus and ovaries of women are located. If you don’t pay attention to hygiene during menstruation or if you don’t take proper care of yourself after an abortion, it can cause pelvic inflammatory disease, with symptoms such as lower abdominal pain and increased leucorrhea, and you need to go to the hospital for a systematic examination and usually pay more attention to hygiene and change your underwear regularly. The abdominal cavity is the cavity between the entrance to the pelvis and the diaphragm. Most of the digestive system is in the abdomen, which means that digestion and absorption of the organism occur in the abdominal cavity. Because of the presence of a large number of digestive organs in the abdominal cavity, the abdominal cavity is more prone to the symptoms of fluid accumulation. A small amount of fluid in the abdomen does not usually cause discomfort, but a large amount of fluid in the abdomen can cause abdominal distention, shortness of breath, or a turbid sound in the abdomen on percussion. After the discovery of fluid in the abdomen, the cause of ascites should be clarified through relevant examinations, and if necessary, puncture can be performed under the guidance of a professional doctor to clarify the nature and cause of ascites for relevant treatment. Since the pelvic cavity and the abdominal cavity are connected, if the inflammation, abscess and tuberculosis in the pelvic cavity are more serious, they will enter the abdominal cavity and cause abdominal infection if they are not controlled.