Coronaviruses, which can commonly infect humans, usually cause mild or moderate upper respiratory illnesses, such as colds. There are also patients who present with gastrointestinal symptoms, which are mild and include runny nose, headache, cough, sore throat, fever, diarrhea, and nausea. Sometimes it causes lower respiratory tract diseases, such as pneumonia or bronchitis, and is more common in patients with heart and lung disease, immunocompromised people, infants and the elderly. Severe illness: It can progress rapidly to acute respiratory distress syndrome, renal failure, and septic shock; and later, as cases are diagnosed, other systems of people’s bodies are found and the first symptoms may appear. Digestive system: mild nausea, weakness, poor spirit, diarrhea, vomiting, etc. may appear; nervous system: headache may appear; cardiovascular system: panic, chest tightness, etc. may appear; systemic symptoms: mild pain in the extremities and low back, etc.