PARIS, France — Exercise has a variable impact on the onset of gastroesophageal reflux disease (GERD) symptoms. The mechanisms at play are complex and seldom studied. Frank Zerbib, MD, head of the ...

I chalked the initial incident up to unfortunate weather conditions. It was 85 degrees, 80 percent humidity, with a UV index of six—not ideal for running at all, let alone an attempt at being ...