question: My name is David Langston.  I am 28 years old, 5' 11", 172 lbs.  I had a vasectomy in April, but no other surgeries.  I do not smoke, do drugs, or drink on a regular basis.  I do not have a history of high blood pressure or cholesterol.  Five days ago I was doing some heavy yard work, and I felt a sharp pain in my abdomen.  The nest morning, I noticed a small lump about the diameter of a dime under the skin just below my naval, though not visable.  I contacted my doctor who was not sure what it was, but he suggested I may have an umbilical hernia.  I have had minor gas pains and I need to use the restroom three times a day - more often than normal.  I am not in pain, though I do feel pressure when sitting upright, and when I massage the area, it feels as though I am massaging my intestines.  Does this sound like an umbilical hernia, or are there other reasons for my discomfort?