What Could Cause Swelling on the Left Side of My Stomach?

There are many reasons that could make the left side of your belly look swollen. One possible reason is a hematoma, which is when blood collects under your skin or in your tissue, often because of an injury or minor trauma. This can cause a swollen, sometimes red or bruised area. Another possibility is bloating, which happens when gas or fluid builds up in your intestine or stomach. Some people with digestive problems may experience this kind of swelling. Even constipation which causes a back up of stool can cause a sensation of swelling in one side of your abdomen. Any condition that causes retention of fluid in the body can also cause swelling, although less likely one sided. Because many things can cause swelling, it is important to have any new or ongoing swelling checked by a doctor. They can ask questions about your symptoms, perform a physical exam, and use tests like imaging if needed to understand why the swelling is occurring and to decide on the right treatment.