Why does gastritis cause shortness of breath?

Not sure . Gastritis is defined as inflammation of the stomach lining due to high levels of acid production. Other causes include using pain killers ( Aspirin , Indomethacin etc). Gastroesophageal reflux ( heartburn) is associated with the above conditions . There is association between uncontrolled heart burn and asthma though it is controversial. I do not see a direct link between gastritis and breathing.

Related Questions

Can gastritis cause shortness of breath and unnecessary heart beats?

No. Gastritis is inflammation of the stomach lining. It should not cause difficulty breathing or extra heartbeats. Upper abdominal or chest discomfort associated with these symptoms may be a sign of heart disease. Discuss with your doctor. Read more...