Can a 21 year old get stomach cancer? Very full after eating a little food. Been dealing with acid reflux and possible ulcer for 4 months now.

Very rare. Did you have esophago gastroscopy ?

Have you had any other tests done?

If you had already go for review in 3 months.

can try dairy free diet- may have yogurt.
It happens....but.. This is a rare cancer at any age in the US. We never say always or never in medicine. Chances are you just have complications from your reflux, if anything more than the common disorder it is. Avoid caffeine and nicotine, don't lay down for at least an hour after any meal & get your reflux under control. If you are preoccupied with cancer at your age you may need to talk to a life coach.