text: help! sensative stomache when it comes to seafood and dairy. any suggestions? my buddy, nice guy, about 23 years old, has a sensative stomache. when he eats seafood, he gets sick and eventually has to vomit, afterwards, he produces a lot of mucus and spits it up all over the damn place! also, when he has dairy products, he produces a lot of mucus. he says he doesnt have any stomache irratation or discomfort (for example, pain or diarhea) except for the vomiting reaction and the mucus. can anyone explain why this happens to him? is there anything he can take to avoid this problem (asside from not eating seafood or dairy)? thanks! the two most common food allergies are shellfish, and dairy.  your friend is allergic.  he should see his doctor, who in turn should refer him to an allergist.  no more eating those foods until he sees the doctor.  subsequent exposure to allergens can increase the risk of a serious reaction!