Symptoms of headache may occur after delta virus infection, and delta virus should be referred to as the delta variant of New Coronavirus. The typical symptoms of New Coronavirus pneumonia are fever, dry cough and malaise, while the clinical symptoms of Delta virus infection are not typical, so it may produce a variety of different clinical manifestations: 1, early stage: most patients show malaise, smell impairment, mild muscle aches, abdominal pain, indigestion, drowsiness, etc. A few patients with more severe cases may show symptoms such as nasal congestion, runny nose, headache, sore throat, conjunctivitis, etc. In addition There are also some patients with asymptomatic infection, i.e. no obvious clinical manifestations, which can be easily ignored; 2. Severe disease: respiratory distress and hypoxemia gradually appear after the onset of the disease, and there can be moderate or low fever or even no obvious fever during the course of the disease. Severe cases may progress rapidly to respiratory distress syndrome, sepsis, and metabolic acidosis and coagulation dysfunction that are difficult to correct. Treatment is based on isolation and symptomatic treatment, bed rest and monitoring of vital signs in mild cases, nebulized inhalation drugs for those with respiratory symptoms, timely and effective oxygen therapy, intubation and ventilation if necessary, and also the use of glucocorticoids as appropriate according to the degree of respiratory distress. Seriously ill patients need to be admitted to ICU for respiratory support, circulatory support, anticoagulation therapy, etc. Therefore, when inexplicable symptoms mentioned above occur, it is recommended to actively seek medical attention, promptly perform nucleic acid testing, and strictly enforce isolation for observation or treatment, and never conceal the symptoms and compromise the protection of the epidemic.