Hi, Thanks for writing in. Sorry to hear about the patient having brain tumor and appendicitis at the same time and having to bear the pain and discomfort. It is not clear regarding what is the type and stage of cancer and the treatment she is under. Appendicitis is a totally different problem and occurs due to infection and inflammation of the appendix located at the beginning of large intestine. There is always a small risk of appendicitis getting ruptured and causing significant problems which can become an emergency and concern to her life. It is best to confirm appendicitis first by doing a CT scan and then to get a surgery done after getting a medical fitness for surgery. This surgery is a simple one and might require her to be in hospital for 3 days. Please approach any government hospital and get treatment done at subsidized rates. Appendicitis should not be ignored. Please do not worry.