Left under the rib swelling pain has the following possible causes: 1, chronic cholecystitis, chronic cholecystitis manifested as nausea, vomiting, stomach bloating and other symptoms, some patients also have symptoms of left under the rib swelling pain, especially after eating pain is more intense. 2, gastritis, usually irregular work and rest, like to stay up late, and three meals a day is not regulated, so there is the possibility of suffering from gastritis, there may be left under the rib swelling and pain in the symptom, and in addition there are heart 3, costochondritis or heart problems, if usually often feel left under the rib swelling pain, and the pain is very often, it may be costochondritis or heart problems. 4, gallbladder stones, if you have gallbladder stones, especially stones in the neck of the gallbladder, will trigger the left under the rib swelling and pain, and abdominal pain. So there are many causes of pain under the left rib, need to go to the hospital for examination and diagnosis and then symptomatic treatment.