For the clinical manifestations of nitrate poisoning: first of all, mild symptoms patients will be mainly cyanosis, skin mucosa, lips, nails, nail beds are most obvious, at the same time there are dizziness, headache, nausea, vomiting, abdominal pain, diarrhea, etc., abdominal pain around the umbilicus colic as the main symptom, diarrhea will be dilute watery stools or mucus pus and blood stools. Secondly, severe patients will also have cardiac arrhythmia, slow heart rate, irritability, decreased blood pressure, and thin pulse. At the same time, the patient will have pulmonary edema, shock, confusion, loss of consciousness, convulsions, convulsions, coma, and in the most serious cases, the patient will die because of respiratory and circulatory failure, so if the patient has nitrate poisoning, it is necessary to go to the hospital in time for consultation.