People allergic to cats will have rashes, respiratory symptoms, and in severe cases, it will lead to anaphylaxis. 1. Skin rash: the antigen will combine with the antibody in the body after stimulating the organism again, and the immune complex formed will lead to an increase in vascular permeability, so the patient will have an eruption-like papule, accompanied by obvious itching of the skin. 2. Respiratory symptoms: cat hair stimulation of the body may cause airway hyperreactivity, so the patient may have a violent dry cough, and in severe cases, wheezing, shortness of breath, chest tightness and other symptoms. 3. Anaphylactic shock: some patients may show severe allergic symptoms such as decreased blood pressure, accelerated heart rate, fainting and diaphoresis. People allergic to cats may have the above symptoms, if the patient is unexplained rash, wheezing, rapid heart rate and other symptoms, it is recommended that the patient go to a regular hospital as soon as possible.