(HealthDay News) — Lactose intolerance is an inability to digest a type of sugar in milk called lactose. It’s a common condition, affecting some 30 million adults in the United States by age 20, the National Library of Medicine says.
The agency offers this list of possible warning signs:
- Bloating in the belly.
- Cramping in the abdomen.
- Nausea or diarrhea.
- Stools that float or have a foul odor.
- Gas.
- Malnutrition.
- Slow growth.
- Losing weight.