The main manifestation of sodium nitrite poisoning is the disease of the central nervous system, such as dizziness, headache, nausea, vomiting, lack of harmony between the hands and feet or lack of mental concentration. The most serious cases may include deep coma, shock, or even respiratory failure due to respiratory depression of the central nervous system, which may be life-threatening. In addition, the respiratory tract may be affected, resulting in pulmonary edema or laryngeal edema, with the main manifestation of general cyanosis and dyspnea. If the liver and kidney function declines or is damaged, there may be generalized swelling and generalized jaundice, hypuria, and anuria.