There are a few known causes of acid reflux:
This happens when the top portion of the stomach moves up into the chest cavity. Without the support of the diaphragm, the lower esophageal sphincter opens more easily.
As we age, our muscles lose tone or strength, including the lower esophageal sphincter, or LES. This muscle serves as the connection between the esophagus and stomach; the LES should remain closed after food passes through. However, sometimes the LES doesn’t close all the way.
Being overweight or obese
Carrying too much weight in the abdomen causes increased pressure on the stomach, which in turn forces stomach acid into the esophagus.
Certain lifestyle habits
Overeating, drinking alcohol and smoking are all known to cause acid reflux.
Taking non-steroidal anti-inflammatory medications like ibuprofen or aspirin; calcium channel blockers for heart conditions and drugs that slow the contractions of the muscles in the intestines can all lead to acid reflux.
Certain medical conditions
People with scleroderma or Zollinger-Ellison syndrome have a tendency to develop acid reflux. Pregnant women also have higher incidence rates of reflux.