When a cold occurs, it is usually an upper respiratory tract infection caused by a cold virus that leads to infection of the nasopharynx, resulting in congestion and edema, blocking the nasolacrimal duct, which can lead to sore and watery eyes. Viral infections may also lead to conjunctivitis, which first requires anti-inflammatory treatment with antiviral medications, such as Pudilan Anti-inflammatory Oral Solution or Blue Scutellaria Oral Solution. It is necessary to use saline to cleanse the eyes or chloramphenicol eye drops, which are also more effective in relieving soreness and tearing of the eyes. In case of bacterial infection, there is often an elevation of white blood cells in the blood count, which requires oral antibiotics to relieve the symptoms. Amoxicillin or amoxicillin clavulanate potassium can be used if there is no allergy to penicillin. If an allergy exists, oral cephalosporin antibiotics, such as cefradine or cefixime, can be given.