<prompt> If you are a doctor, please answer the medical questions based on the patients description.my 3 year old has vomited about 5 times during the last 24 hours and recently coughed up brown mucus with what looks like bloood. she s in good form but says her tummy hurts, docs did a urine test which was negative yesterday. she hasn t eaten much and i don t know how to help  <response>: Hi, Welcome to Chat Doctor. Can understand your concerns. Vomiting in a 3-year-old child can be due to acute gastroenteritis, food poisoning acute gastritis. in acute gastroenteritis, there is fever, pain abdomen, vomiting followed by loose stools. in acute gastritis, there is vomiting, regurgitation of feed. Fever can be present. in food poisoning, there is history of eating food from outside. There is fever and vomiting. the main thing that we have to take care is deny Chat Doctor. Start ORS solution to prevent deny 