lactose intolerance and milk allergy concept. woman hold milk glass and having abdominal cramps and pain when drink cow milk.

abdomen abdominal ache allergic allergy avoid bad belly bloating calcium cow cramps dairy diarrhea diet digestive disease drink enzyme food gas glass health human hurt illness intestine intolerance intolerant lactase lactose medical milk nausea pain patient prebiotic probiotic products sickness small stomach stomachache stop sugar symptom system unhealthy white woman