Hello, Flu may cause abdominal pain and vomiting in children but is not the typical presentation. Other viral infections may cause similar symptoms as well. Because her abdominal pain is severe and she is throwing up it is best to have the child examined and rule out acute abdomen first (acute causes of abdominal pain). If the abdominal examination is within normal limits then she just needs to be monitored and also it is important to be kept well hydrated (she will need oral rehydration solutions). I hope this answers your query and is helpful to you. Let me know if I may assist you further. Regards, Dr. Antoneta Zotaj, General and Family Physician