Unlike a cold, symptoms of the flu typically come on very rapidly and tend to last a shorter amount of time. To avoid complications such as dehydration, it is important to be aware of flu symptoms and monitor them. These are the most common symptoms of the flu:Body aches and feverUnlike the common cold, the flu usually causes a fever in adults and children, as well as widespread aches in muscles and joints. The fever often goes over 101 degrees Fahrenheit and should be checked regularly. Fever and body aches can be treated with Tylenol (acetaminophen) or Advil/Motrin (ibuprofen), but be careful of overdoses. Many over-the-counter medications used to treat symptoms of cold and flu, such as Nyquil, contain dosages of these drugs and should not be taken in combination. Before giving children these medicines, ask a pharmacist for dosage recommendations.Respiratory problemsThe flu often causes a sore throat and sinus congestion, as well as other respiratory issues such as a dry cough. These symptoms are usually not serious and can be treated by ingesting plenty of fluids, gargling and using throat lozenges, antihistamines and decongestants. If these symptoms persist after other signs of the flu disappear, an infection may be present and you should consult a doctor.Headache and fatigueExtreme fatigue is a common symptom of the flu, as are headaches. These symptoms are usually not serious, and can be treated at home. You can take over the counter pain relievers to treat headaches, but be aware of dosage recommendations and don't give aspirin to children. For fatigue, rest and plenty of liquids are the best treatments.Knowing how to deal with these symptoms at home is important, as the flu can be contagious and is not treatable with antibiotics. Most symptoms of a flu clear up within a week, but if they persist longer or are accompanied by a persistent fever above 104 degrees Fahrenheit or severe nausea and vomiting, go to an emergency room for treatment. You should also consult a doctor for treatment if the symptoms disappear but then return later.