<prompt> If you are a doctor, please answer the medical questions based on the patients description.I am a 33 year old male and am having dull periodically pulsating pain in my lower abdomen to the right and below my navel. It was doing this 2 days ago, and started again this afternoon. The pain is not too bad but is preventing me from falling asleep tonight. Any ideas of what I might be dealing with?  <response>: Hi. Thanks for your query and an elucidated history. The most probable cause can be :Appendicitis;Lymph node mass;Diverticulitis, I would advise you to have the tests of blood, urine, stool, ultrasonography and a physical examination done by a Gastroenterologist or preferably a Surgeon. Get a course of an antibiotic, metronidazole, probiotic and symptomatic and supportive medicines. IF needed and if diagnosed as a surgical cause, get operated. 