Nausea and vomiting are not disease , but rather are symptom of many different condition , such as infection (stomach ful) , food poisoning , motion sickness , overeating blocked intestine , illness , concussion or brain injury , appendicitis , and migraines . Nausea and vomiting can some time by symptoms of more serious diseases such as heart attacks , kidney or liver disorders , central nervous system disorders , brain tumors , and some from of cancer.