There can be different clinical manifestations according to the etiology. The characteristic manifestations for food poisoning are as follows: 1. Gastrointestinal food poisoning symptoms are mainly nausea, vomiting, abdominal pain and diarrhea. 2. Neurological food poisoning symptoms are mainly headache, head, weakness, nausea and vomiting, eye muscle paralysis, etc. 3. Salmonella poisoning is mostly caused by eating meat or offal, especially diseased domestic animals. The incubation period is 6～24h, the longest can be 2～3 days, there are fever, headache, nausea, vomiting, diarrhea, general malaise, can be accompanied by skin rash, stool with pus and blood. The course of the disease is 1 to 3 weeks, and death can occur. 2. Staphylococcal poisoning is caused by leftover food, contaminated meat, milk and eggs after eating. The incubation period is short, usually 3h, with vomiting and diarrhea, mainly vomiting, and fever is not obvious. 4. Salinophilic bacteria poisoning, caused by eating seafood or food salted with salt, incubation period 8-12h, with abdominal pain, diarrhea with vomiting, moderate fever, and feces washed water-like or pus-blood stool. 5, botulism, botulism is anaerobic bacteria, mostly caused by eating expired cans, salami or closed storage food, incubation period of 1 day to several days, neurological symptoms are obvious, there are headache, dizziness pupils dilated, weakness, drooping eyelids, diplopia, blurred vision, and even blindness, swallowing and breathing difficulties, loss of voice, can die due to respiratory paralysis. 6, Escherichia coli incubation period is short, generally 4 to 12h The symptoms are light, mainly diarrhea, fishy-smelling stools, rarely fever. 7, the fungus generally has gastrointestinal symptoms first, and then liver and kidney damage or neurological symptoms, such as headache, dizziness, irritability, convulsions, coma, some fungi cause neutropenia or lack of, thrombocytopenia, etc.