Bloating after drinking milk or eating dairy
Gas after consuming dairy
Stomach cramps after dairy
Diarrhea after dairy
Nausea after dairy
Symptoms starting within 30 minutes to 2 hours after dairy
Symptoms improving when you avoid dairy
Symptoms returning when you eat dairy again
Tolerating lactose-free milk better than regular milk
Tolerating hard cheeses or yogurt better than milk
Getting symptoms more often after larger amounts of dairy
Family history of lactose intolerance
Confirming with a lactose tolerance test
Confirming with a hydrogen breath test
Confirming with a stool acidity test in children