How does one know if they are lactose intolerant?

Question

I'm a teenager, and up until about last year, I've had no problem with having milk or any other dairy products.
But now, if I have cereal with milk, eat yogurt, or even make pancakes/waffles with milk/buttermilk in the mix, I end up with stomach pains, gas, feeling a bit nauseous and sometimes, diarrhea.
However, I can manage to eat a little ice cream or cheese at times, and I don't have any of the symptoms mentioned above.
Could I be lactose intolerant? How can I know for sure?

Thanks!

Answer 1

Sounds like you probably are lactose intolerant. Try drinking the lactose-free milk or eating lactose-free dairy and see if you still have the pain, gas and nausea and diarrhea. If you do, then the problem is something else. Process of elimination.

Answer 2

Check with your Dr. there might be a test to see if you are lactose intolerant.