Symptoms before a cold are not obvious, and some patients may experience nasal symptoms such as nasal congestion and runny nose, as well as pharyngeal discomfort such as dry throat. Colds are considered to be the result of infection by pathogens such as rhinovirus, coronavirus, respiratory syncytial virus, coxsackievirus, and adenovirus. Most patients do not have obvious symptoms before catching a cold, but a small number of patients will have nasal congestion, runny nose, sneezing and other nasal discomforts, and some patients will also have dry throat, itchy throat and pharyngeal discomfort. It is recommended that patients should drink more water when they have a cold, take more rest and avoid overwork. Diet needs to eat vitamin C-rich fruits and vegetables, such as tomatoes, cucumbers, apples, green vegetables and so on. In addition, usually pay attention to keep warm, avoid getting cold, avoid getting wet, and you can have proper physical exercise every day.