Symptoms of milk intolerance, also known as lactose intolerance, include bloating, gas, cramps or pain in the lower abdomen and vomiting, usually within 30 minutes to 2 hours after consuming milk or dairy products, notes WebMD. Rumbling or gurgling sounds in the lower abdomen, diarrhea or loose or foamy stools are additional symptoms. The amount of lactase made by the body determines the severity of lactose intolerance symptoms.
Occasional symptoms following the consumption of dairy products are generally not indicative of lactose intolerance, notes WebMD. However, experiencing symptoms each time after eating dairy products, including milk and ice cream, may indicate the presence of the condition.
Although lactose intolerance occurs in children and infants, the onset of symptoms is generally not seen until the teen or adult years, reports WebMD. The condition is sometimes a lifelong one, although acquired lactose intolerance symptoms often improve when the small intestine resumes production of lactase. Although the condition is rarely seen in infants, its symptoms include slow weight gain, irritability, weakness, dehydration, vomiting, diaper rash and diarrhea.
Milk allergies and lactose intolerance are two different conditions, according to WebMD. Those with allergy experience similar symptoms as those with lactose intolerance, but the symptoms are usually more pronounced and severe.