Chestnut allergy belongs to food allergy, and the symptoms of food allergy include skin symptoms, oropharyngeal symptoms, respiratory symptoms, gastrointestinal symptoms, cardiovascular system symptoms and so on. 1. Skin symptoms: the most common skin manifestations of food allergy are acute urticaria and angioedema, in which the patient’s skin will have erythema, doughnuts, edema, etc., as well as obvious itching. 2. Oropharyngeal symptoms: food allergy can lead to itching and mild swelling of the lips, tongue, palate and pharynx. 3. Respiratory symptoms: food allergy can lead to nasal itching, nasal congestion, sneezing, coughing, wheezing, and in severe cases, dyspnea and other symptoms. 4. Gastrointestinal symptoms: food allergy can cause nausea, vomiting, abdominal pain, diarrhea, mucus stools and other symptoms. 5. Cardiovascular system symptoms: Food allergy may cause symptoms such as decreased blood pressure, impaired consciousness and anaphylactic shock. It is recommended to consult a doctor in time for the above mentioned allergies and receive targeted treatment from the doctor.