A 16-year-old man was seen at the hospital because of severe pain backward the sternum while swallowing lasting for several days. There was no paticular physical findings. Laboratory data were within normal range. Endoscopic examination of the esophagus revealed an oval shaped ulcer A₂-H₁, about 1cm in diameter locating at 30cm from the incisor. Immediately, fasten therapy and hyperalimentation as well as oral medication including antiacids were started. The patient completely recovered and was discharged from the hospital on the 17th hospital day. There has been no sign of recurrence as of four months after the therapy. Esophageal ulcer uncommonly occurs in juvenile people. A successfully treated case of acute nonspecific esophageal ulcer of unknown origin in a young man is described here.