Why am I so gassy. Excessive gas can be caused by several different factors, such as swallowing too much air, eating foods that are difficult to digest, having food intolerances, digestive disorders, dietary changes, or certain medications. It can also be related to an underlying health condition, such as irritable bowel syndrome (IBS) or gastroesophageal reflux disease (GERD). It is important to talk to your doctor if you are experiencing excessive gas or bloating, as they can help you identify the cause and develop a treatment plan.