Stomach pain when breathing can have several possible causes, such as a hiatal hernia, pleurisy, or acid reflux. Pain while breathing can also indicate a medical emergency.
When a person breathes, the diaphragm tightens and relaxes as air moves in and out of the lungs. The diaphragm is a large, thin muscle at the bottom of the chest.
Due to the position of the stomach just below the diaphragm, pain when breathing can feel as though it is in the stomach when it is actually coming from the diaphragm or other nearby chest muscles and tissues.
In this article, we describe some of the possible causes of stomach pain when breathing. We also explain when to see a doctor.