Right lower abdomen pain when pressed may be due to appendicitis, ovaritis, intestinal tumor, pelvic tumor. 1. Appendicitis: due to individual differences, the position of appendix is not fixed, usually located in the right lower abdomen, if the appendix is infected, it may cause pain. It is also accompanied by fever, nausea and vomiting, diarrhea and other symptoms, resulting in pain when the patient presses on the right lower abdomen. 2. Ovaritis: the right ovary is located near the right lower abdomen, if the patient’s ovary accumulates a large amount of fluid may stimulate the tissue structure of the ovary, resulting in an inflammatory reaction, which may trigger pain when pressed in the right lower abdomen. 3. Intestinal tumor: if there is a space-occupying lesion in the right lower abdomen, it may be an intestinal tumor, such as ileum tumor, which leads to pain when the patient presses on the right lower abdomen. 4. Pelvic tumor: the pain in the right lower abdomen when pressed may also be caused by pelvic tumor, which presses the surrounding tissues and produces pain. In addition, urinary system diseases, such as ureteral stones, prostatitis, etc., can also lead to lower right abdominal pain. If the pain does not improve for a long time or recurring, the patient needs to go to the hospital in time.