Chest tightness and shortness of breath from eating betel nut is due to the fact that betel nut contains many alkaloids, the most important components are betel nut alkaloids and betel nut hypocretin, which have certain stimulating effects on the central nervous system. These alkaloids have some stimulating effect on the central nervous system. They usually manifest as nerve paralysis, which can produce transient dizziness, accompanied by cerebrovascular blood supply insufficiency, and also excite sympathetic nerves and cause cardiac arrhythmia, which can lead to transient spasm and ischemia of the large arteries of the heart. The arrhythmia may lead to transient spasm and ischemia of the large arteries of the heart, which may cause insufficient blood and oxygen supply to the heart, resulting in chest tightness, shortness of breath, and palpitations. At this time, it will also be accompanied by dizziness, headache, transient unconsciousness or blurred vision, double vision, visual vertigo, rotation and other clinical state reactions, which are all due to the activation of sympathetic and parasympathetic nerves by betel nut alkaloids after eating betel nut, which triggers the excitatory effect.