The earliest symptoms after organophosphorus poisoning are mainly muscarinic symptoms, due to smooth muscle spasm and hypersecretion of glands caused by excitation of parasympathetic nerve endings, and the clinical manifestations of the patient are mainly nausea, vomiting, abdominal pain, diarrhea, periumbilical colic, accompanied by watery stools. Patients will also experience a series of symptoms such as upper gastrointestinal bleeding, as well as obvious excessive sweating, tearing, runny nose, salivation, as well as frequent urination, urinary and fecal incontinence, slow heart rate, pinpoint pupil constriction, as well as bronchial spasm, increased bronchial secretion, and the patient will experience coughing, coughing up sputum, shortness of breath, wheezing, as well as pulmonary edema. Patients will also experience dizziness, headache, dyspnea, chest tightness, shortness of breath, precordial discomfort, which are the earliest symptoms of organophosphorus pesticide poisoning.