Symptoms of a severe cold mainly include nasal symptoms such as sneezing, accompanying symptoms such as sore throat and systemic symptoms such as fever. Common nasal symptoms include sneezing, nasal congestion, and runny nose. Some patients may also present with cough, dry throat, pharyngeal itching or burning sensation or even postnasal drip sensation. The dry, itchy or burning sensation of the throat is mainly related to the hypersensitivity of the afferent nerves of the upper respiratory tract caused by virus-induced inflammatory mediators. With the progression of the disease, the nasal mucus may become thick, and may be accompanied by symptoms such as sore throat, tearing, dyspnea, hoarseness, and so on. Patients with severe colds often have fever, chills, headache, malaise and other symptoms. Nasal symptoms of influenza are not obvious, usually manifested as high fever, malaise and other systemic symptoms. In case of severe influenza, complications such as pneumonia and myocardial injury may occur and manifested as dyspnea, chest tightness, palpitations and other symptoms, and in severe cases, even multi-organ dysfunction such as respiratory failure may occur, which is worth paying attention to. If you feel unwell, it is recommended that you consult a doctor in time for standardized treatment.