Diagnosing the cause of abdominal pain involves a combination of patient history, physical examination, and sometimes additional tests. The healthcare provider will ask about the pain's onset, duration, location, and characteristics. They will also inquire about associated symptoms such as fever, vomiting, diarrhea, or weight loss. Physical exams may include palpation of the abdomen to identify tenderness or swelling. Additional tests, such as blood tests, urinalysis, ultrasounds, or X-rays, may be required for further evaluation.