Following peptic ulcer surgery, some patients experience wide-ranging symptoms called dumping syndrome. Symptoms often occur in the early post-surgery period. Experienced within 30 minutes after eating, these symptoms include palpitations, lightheadedness, sweating and a drop in blood pressure upon standing. Late dumping syndrome, which occurs 30 minutes to three hours after eating, can involve any of these symptoms or additional confusion and even loss of consciousness.
For obvious reasons, diving is not recommended with these symptoms.