You may notice you feel extra full, for instance, which can indicate bloating. Also, you may pass more gas when you eat dairy foods, such as milk or cheese. Gas can make your stomach feel rumbly, too. Passing gas can come in the form of flatulence or belching. When you eat dairy, you may notice that your stomach complains about it, literally. It might make noises as it's trying to digest the lactose in the milk and can't. Sometimes, it may sound like your hungry, for instance, even if you just ate. It can sound like gurgles and pops. Because your stomach is having trouble digesting the lactose, it might hurt some. For instance, you might feel sick to your stomach or feel heavy cramping in the area. You might just feel a bit queasy, too, like you don't really want to eat. Cramping feels like someone is squeezing your muscles, and it is painful. Diarrhea, or loose stools, is more common. If you find yourself running to the bathroom more after eating dairy, that could be a sign of lactose intolerance. However, you may also have instances of vomiting. Basically, any kind of stomach discomfort could indicate lactose intolerance. Of course, you should be looking for these symptoms specifically after eating dairy products.

Summary:
Notice gas and bloating, particularly after eating dairy. Listen for grumbling from your abdomen. Pay attention to nausea and abdominal cramps. Look for diarrhea and vomiting.