Oleander is a fruit with a sour taste in the flesh of the peel, which will have a sour and astringent feeling when chewed in the mouth, followed by a clear and sweet taste. Oleander is rich in vitamins, minerals and trace elements, dietary fiber and other nutrients as well as phytochemicals, usually, moderate consumption is good for replenishing the nutrients needed by human body, there is no special strict contraindication, most people can eat, but there are some people should not eat a lot. According to the Chinese medicine, the oil mandarin seeds have the function of clearing the lung and dissolving the phlegm, generating fluid and quenching thirst, stopping bleeding and inhibiting bacteria. However, because of the cold nature of oil citrus, people with cold constitution, weak spleen and stomach or gastrointestinal tract diseases cannot eat more or cannot eat oil citrus. If people with cold constitution consume too much oil mandarin seeds, it may induce or aggravate the symptoms of cold limbs, pale face and weakness; people with weak spleen and stomach often show symptoms of abdominal distension, indigestion and diarrhea, and excessive consumption of oil mandarin seeds may aggravate the symptoms. For gastrointestinal diseases, such as gastric ulcer, acute gastritis, patients are not recommended to eat oil citrus, so as not to cause ulceration of gastric mucosa and inflammation aggravation, induce or aggravate stomach pain, acid reflux and other symptoms. In addition, patients who are allergic to oil mandarin seeds should avoid eating oil mandarin seeds, so as not to trigger the allergic symptoms of the body, rash, fever and other symptoms, and even wheezing, breathing difficulties, and even unconsciousness in serious cases, which is more critical. Therefore, those who have similar allergic symptoms and suspected allergy need to be sent to the doctor immediately for treatment.