If there are signs of a respiratory infection, it is mostly caused by bacteria, viruses, and other microbial infections. It is advised to undergo a routine blood test under the guidance of a doctor to determine the type of infection, and then to treat it with appropriate anti-infective medication as directed by a doctor. Symptomatic treatment should also be given. Common symptoms of respiratory infections include coughing, sputum production, and sore throat. During such times, it's advisable to take cough suppressants and expectorants, or use throat lozenges to alleviate sore throat. Additionally, drinking more water to aid metabolism and enhance immunity, eating a light diet, avoiding staying up late, maintaining a relaxed mood, and avoiding excessive stress or emotional excitement are recommended.