After chemical poisoning, patients often have the following symptoms: 1st, patients will have severe symptoms of central damage, severe headache, dizziness, weakness, tremor of limbs, general numbness, etc. In severe cases, patients will have fainting and coma, etc. Secondly, after chemical poisoning, patients will obviously show symptoms of gastrointestinal irritation, and many of them have a series of gastrointestinal symptoms such as abdominal pain, diarrhea, nausea, vomiting, pus and blood stools and gastrointestinal perforation. Patients who have been poisoned should go to the hospital for gastrointestinal medication in time to ensure their health. Third, after chemical poisoning, patients will also have respiratory manifestations, such as coughing, difficulty in breathing, and asthma attacks. In addition, chemical poisoning can lead to damage of multiple internal organs and thus bleeding organ failure symptoms, such as elevated liver transaminases, hematuria, proteinuria and a series of other symptoms.