Nausea or feeling sick and vomiting that appear while eating or soon after finishing the meal are usually symptoms of food indigestion and most likely a sign of peptic ulcer.
Symptoms of peptic ulcer, stomach or duodenal ulcer, tend to come and go, being more predominant during spring, fall and stressful periods.

Encourage your son to see his physician, since ulcer may perforate and bleed, and even may turn into cancer.
When diagnosed it can be treated effectively!

Best wishes!
Marija