The symptoms of skin allergy are usually as follows: i. The symptoms of skin allergy, skin flushing, macular rash, papular rash, allergic urticaria, allergic drug rash, and even fusion into wind clusters, epidermal scratches, scratch marks, vesicles, etc. are all skin symptoms of allergy after cephalosporin injection. Second, in severe allergy, symptoms of circulatory system may also appear, such as tachycardia, arrhythmia, chest tightness, shortness of breath, palpitations, discomfort in the precordial area, and in severe cases, respiratory difficulty. Third, the most serious symptoms of cephalosporin allergy will be typical dizziness, headache, even transient loss of consciousness, anaphylactic shock, unmeasured blood pressure and pulse, pale, wet and cold skin, fine and rapid pulse, reduced urine volume or no urine, all of which are symptoms of cephalosporin allergy of different degrees.