There are many possible reasons why your stomach may be bloated. Some common causes of bloating include eating too much, eating foods that are difficult to digest, drinking carbonated beverages, and constipation. Bloating can also be a side effect of certain medications, or it can be a sign of a medical condition such as irritable bowel syndrome or lactose intolerance. It's always a good idea to talk to your doctor if you're experiencing persistent bloating, so they can help you determine the cause and provide appropriate treatment.