How does stress increase stomach acid and leads to ulcers?

Ulcers and stress: Tis is a complicated answer but let me try to explain it simply. In periods of stress, there is an over production of two hormones from the adrenal. One is adrenalin, which can stimulate the cells in the stomach to produce more acid. The 2nd hormone is cortisol, which when too abundant, can thin the lining of the stomach thus leading to the ulcer. You also need to rule out other causes.