A fast heartbeat during lunch break should be considered to be caused by physiological factors, organic cardiac lesions and other systemic diseases. If the symptoms are obvious, it is recommended to consult a doctor. 1. Physiological factors: recent stress, fatigue, drinking coffee and strong tea may cause fast heartbeat symptoms. 2. Organic heart disease: such as coronary heart disease, myocardial infarction, heart failure, heart valve disease, cardiomyopathy, etc. can cause many types of tachyarrhythmias. 3. Other systemic diseases: such as hyperthyroidism, anemia, hypoglycemia, infection, etc. can lead to tachycardia. If the symptom of fast heartbeat during lunch break persists or recurs, it is recommended to consult a doctor in time to clarify the cause and treat according to the doctor’s instructions. It is recommended that people with this symptom should pay attention to rest and avoid excessive activities, late night and mental stress.