There are two main types: diverticulosis (inactive) and diverticulitis (active).
The inner lining of the bowel protrudes through the muscle layers creating small pockets know as diverticula. As waste passes through the bowel small pieces can get stuck in these pockets and cause inflammation this is what we would call diverticulitis.
Low fibre diets, lack of water and refined foods are the most common cause due to the bowel not evacuating properly and causing waste to get stuck.
Common signs are:
Constipation and diarrhoea alternating
Pain on the lower left of the abdomen.
Bright red blood maybe seen in the stools.