Lactose intolerance occurs when your body does not produce enough lactase --- an enzyme your body needs to digest lactose, a type of sugar present in milk and other dairy products. Lactose intolerance can begin at any age, but typically develops during adulthood. Symptoms of lactose intolerance are similar in adults and children. If these symptoms become bothersome, try avoiding the offending products or substituting lactose-free versions of them in your diet.
Gas and Bloating
If you are lactose intolerant, consuming dairy products may cause excess gas to accumulate in your intestinal tract. You may feel bloated or uncomfortably full. You may also experience odorous flatulence. While these symptoms are unpleasant, they typically subside within a few hours, depending on the amount of dairy you consume. Eating several servings of macaroni and cheese, for example, may leave you feeling bloated for a day or two, while indulging in a small amount of whipped cream with your slice of pumpkin pie may cause minor discomfort. Seek care from your medical provider if you experience persistent bloating or gas, as these symptoms of lactose intolerance may also be signs of other gastrointestinal problems.
Stomach Pain or Nausea
Eating dairy products may irritate your stomach and lead to stomach pain or nausea and, in severe cases, vomiting. Typically, these symptoms arise within 30 minutes to two hours following consumption of lactose-laden food. Consult your doctor immediately if you experience sudden or severe stomach pain accompanied by nausea or vomiting, which may be signs of other medical issues.
Diarrhea
You may develop diarrhea one to two hours after you eat a dairy product. Diarrhea may also be accompanied by bloating, abdominal cramping or anal itching and may exacerbate nausea. If your diarrhea symptoms persist for longer than a day or two, contact your doctor. Chronic diarrhea may elevate your risk of becoming dehydrated.
