Hello, and welcome to HCM!
The most common cause of pain in this area of the abdomen is called diverticulosis
. The large intestine (colon
) is lined by muscles which squeeze in a rhythmic motion. Sometimes the wall of the colon pokes out (forming pouches that are called diverticuli) between the muscles as they squeeze.
This is a very common condition that usually doesn't cause pain. However, if these pouches become inflamed or infected, they can cause pain. Occasionally a short course of antibiotics is necessary to treat this infection.
This, of course is just one of many reasons he may be having this pain. If it continues or worsens, he should see his doctor. His sleep apnea
and blood pressure are serious problems that should be carefully managed by his doctor as well, but they are not likely related to his abdominal pain
I wish you well in the future, and thank you for your question.