The location of your abdominal pain can be a clue to its cause. If your pain happens on your lower left side, the most common culprit is diverticulitis of the colon. This is a complication of diverticulosis, a condition in which small pouches develop on the lining of your intestines. As these pouches become inflamed (a condition called diverticulitis), you’ll likely have severe abdominal pain. Irritable bowel syndrome also may cause pause pain in your lower left abdomen.
Pain in your upper left abdomen has many possible causes, including:Inflammation of your pancreas, called pancreatitis
Pancreatic cancer
Enlarged spleen, called splenomegaly
Inflammation of your stomach lining, called gastritis
Stomach ulcer
Bile reflux
Stomach cancer
Kidney infection
Kidney stone
