The clinical manifestations of cardiac preexcitation syndrome include paroxysmal palpitations, chest tightness, cardiac insufficiency and syncope. 1. Paroxysmal palpitation, chest tightness and chest pain symptoms: patients feel panic and a strong beating sensation of the heart, which will suddenly attack and stop, accompanied by chest tightness, dizziness, pallor and other symptoms, and if the condition is serious, chest pain symptoms will appear. 2. Symptoms of cardiac insufficiency: Tachycardia has a long duration of attack, and patients who have other underlying cardiac diseases may have symptoms such as dyspnea, hypotension, leg edema, and so on. 3. Syncope: In severe cases, ventricular fibrillation may be induced, leading to syncope and sudden death. If the above symptoms occur, it is recommended to consult a doctor in time and standardize the treatment under the doctor’s guidance to avoid further aggravation of the condition and serious complications.