Diarrhea all the time is not necessarily due to novel coronavirus infection, but may be caused by catching a cold or eating expired or spoiled food. If diarrhea symptoms occur due to novel coronavirus infection, patients are not recommended to treat themselves and should go to a state-designated hospital for isolation treatment. Because novel coronavirus infection in humans progresses rapidly, patients may have respiratory distress and other manifestations for a short period of time, and severe cases may also lead to fatal complications such as acute respiratory distress syndrome and septic shock. At the same time, patients should be appropriately nourished with oral or intravenous rehydration to avoid water-electrolyte imbalance and appropriate application of mucosal protective agents, such as montelukast.