If an upper respiratory tract infection is severe, it is necessary to take anti-inflammatory and anti-infection medications under the guidance of a doctor. The first and most important step is to identify the cause of the infection under medical supervision and then use medication accordingly, which is crucial. Additionally, it is advised to support the treatment by drinking more water, resting adequately, avoiding overexertion, and eating a bland diet without spicy, greasy, or cold and irritating foods. An upper respiratory tract infection may also be accompanied by fever. If the body temperature exceeds 38.5℃, fever-reducing medications should be taken. Moreover, it is important to drink plenty of water to promote excretion. If the body temperature is between 37.5℃ and 38.5℃, physical cooling methods can be used. It is also recommended to rest well, frequently ventilate indoor spaces, and ensure air remains fresh and circulating.