There are many reasons that may trigger pain below the belly button, as follows: First, appendicitis, when suffering from appendicitis, there will be pain below the belly button, and the pain is intense and irregular. Second, acute gastroenteritis, intestinal germ infection, intestinal obstruction and other intestinal diseases may also trigger pain below the navel, in addition to pain, there may also be diarrhea, vomiting and other symptoms. Third, the reproductive system diseases, if it is a male, prostatitis and other diseases may trigger the abdomen to appear falling pain. If it’s a woman, and suffering from uterine diseases, such as fibroids, uterine inflammation and other diseases, it may also trigger pain in the abdomen. Patients must go to the hospital in time for examination, especially if the pain is more intense, must not be delayed to avoid more serious consequences.