The typical symptoms of an upper respiratory tract infection include nasal congestion, coughing, swelling and pain in the throat, phlegm, and difficulty breathing. During the acute phase, it can also cause chills, high fever, and loss of appetite. It is important to determine whether the infection is caused by bacteria, a virus, or mycoplasma, and to treat it accordingly with targeted antibiotics or antiviral medications. Avoid eating highly irritating foods, measure body temperature twice daily, and treat the cause while managing the symptoms. Generally, one can gradually recover back to normal health within three to seven days.