<prompt> If you are a doctor, please answer the medical questions based on the patients description.My daughter is 10 years old. Two days ago she had gone on a school field trip toSea World. The morning after she returned she had complained of contraction like pain to her left lower side of her abdomen. She also complained of leg pain. I stretched her thinking that it may be muscle pain from the rollercoasters. She woke up the second day with the same severe pain with diarreah. she has not eaten at all on the third day. I dont know what this is.  <response>: Hello, Probably the most common reason that a child is experiencing muscle pains and diarrhea is that she has a viral illness. There are many viruses that circulate in the community during the summer. They can cause sickness with various symptoms: -headache-sore throat- cough-vomiting-diarrhea-muscle and joint pains-loss of appetite Even if your daughter does not want to eat, it is important that she stay wealthy Chat Doctor. If she does not keep 2-3 ounces of clear fluids down, then offer sips every 5 minutes until she stops vomiting. Take her temperature to make sure she has no fever. Acetaminophen as needed for fever and muscle pains. If she is still not eating after 2 days, take her to her pediatrician. Hope I have answered your query. Let me know if I can assist you further. 