What beer or liquor gives you the most tummy trouble?

Whiskey, in my experience.  

If you mean vomiting.  It's hard stuff if you are not used to it.  If you mean diarrhea, then it is any alcohol can do that, but I find beer worst.

Red wine does it.  

Guiness or any strong Irish stout causes tummy trouble. If I do car bombs (dropping a shot glass of Baileys Irish cream) in a Guiness it will make me want to covert away from catholicism and I'm not even catholic. Sometimes citricey drinks like lime marguaritas makes my stomach hurt. After a couple of those, I want to run to the border and I'm a U.S. citizen. Sake is horrible stuff except the cold fruit flavored sake. Hot sake can cause an international incident and make people feel compelled to get vaccinations.

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I have found it takes me a bit of time to adjust to rum, although a higher-dollar rum is more fun to adjust to. Also for the first time, I tried some Midori last week and it turned me a bit green as well.

Anything made by Anheuser Busch will give me a headache within minutes of drinking it. It doesnt matter if its Budweiser, Busch, Michelob, or any of their light beers. Not so much belly trouble, just a pounding freaking headache.

At close to 70 years, most high proof spirits make my stomach burn. Gin and vodka seem the worst.

Always had an issue with flaming shots of Sambucca. Once burned off my beard. 

just dont drink then

If anything that's alcoholic is giving you stomach problems try a little bit of wine and see if that gives you problems.  If a little bit of red wine gives you stomach problems then you have something going on in your stomach you could have ulcers or a stomach disease and you need to see a doctor right away.

Alcohol as you find in red wine or in beer it shouldn't be giving you a problem a little bit of alcohol is actually very good for your stomach.  If you put something of low alcohol content into your stomach and it instead aggravate your stomach that's because your stomach's already aggravated and all the alcohol is doing is making it show up.