Health Tip: Signs of Lactose Intolerance

Jan. 7 -- (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.