The burning, gnawing sensation that strikes in the upper abdomen often gets dismissed as ordinary indigestion or heartburn. Yet for millions of Americans, this pain signals something more serious: ...

The symptoms of a stomach ulcer in people assigned male at birth may differ in some circumstances from people assigned female at birth. But across genders, stomach ulcer symptoms are largely the same.

Illustration by Jared Bartman / The Atlantic. Source: Alamy. It survives, for example, by producing “copious amounts” of an enzyme that neutralizes stomach acid, Richard Peek, a gastroenterologist at ...

Various cells in the stomach secrete digestive enzymes and hydrochloric acid. These substances break down food so the body can absorb nutrients. The stomach is a muscular organ in the upper abdomen ...