Food intolerance is a complex allergic disorder with common symptoms such as abdominal pain, diarrhea, headache, fatigue, and hives. It is associated with a variety of chronic diseases and can involve multiple systems of the body such as digestive, neurological, skin, etc., and so on. 1. Digestive system: common symptoms include abdominal pain, diarrhea, bloating, nausea and vomiting. 2. Nervous system: common symptoms include anxiety, depression and irritability. 3. Respiratory system: common symptoms include shortness of breath, chronic cough, sore throat, chronic sinusitis, etc. Some patients may be induced asthma attacks. 4. Skin system: common symptoms include eczema, urticaria, and dry skin. 5. Genitourinary system: common symptoms include frequent urination, urinary urgency, vaginal itching, abnormal vaginal secretions, etc. 6. Cardiovascular system: common symptoms include hypertension, arrhythmia, chest pain, etc. 7. Others: fatigue, dizziness, headache, etc. If the above symptoms occur, it is recommended to go to the hospital in time for early and regular treatment.