It is little pouches/bulges in your intestines and seeds from foods like tomatoes irritate it. Can cause pain. Look up on internet diet for diverticulitis.
Diverticulosis is normally a thing that runs somewhere in your family. It causes a lot of pain until you have surgery. DO NOT EAT peas, corn, seeds or anything that is tiny. What happens is tiny food deposits into your sockets and thats what causes infection. If not treated and this continues it can cause severe swelling and pain.My husband went in for surgery and he was fine a week later
Go to gastroenterolgy forum and check around there.