The symptoms seasonal flu are fatigue; fever; cough; chills; sore throat; sneezing and muscle aches. Some people experience vomiting and/or diarrhea. Flu is caused by the influenza virus, and can be spread by coughing, sneezing and close contact. Anyone can get flu, but the risk of getting flu is highest among children. Symptoms come on suddenly and may last several days. They can include: fever/chills, sore throat, muscle aches, fatigue, cough, headache, runny or stuffy nose. In children, emergency warning signs that require urgent medical attention include: fast breathing or trouble breathing; bluish or gray skin color; not drinking enough fluids; severe or persistent vomiting; not waking up or interacting; irritability to the point of not wanting to be held and flu-like symptoms that improve but then return with fever and worse cough. For adults, emergency warning signs that require urgent medical attention include: difficulty breathing or shortness of breath; pain or pressure in the chest or abdomen; sudden dizziness; confusion; sever or persistent vomiting and flu-like symptoms that improve but then return with fever and worse cough. Further inquiries or concerns should be directed to the patient's personal physician, or 9-1-1 if urgent.