Pre-phase contractions are premature beats, including atrial premature beats and ventricular premature beats. As the name implies, premature contraction is a jump in advance, and premature beats come earlier than normal, as follows: 1. Patients may feel their heart beating a bit earlier, or some premature beats may not feel obvious, and feel that they are stopping a bit, so they do not feel premature beats; 2. Some patients with premature beats feel panic, and their heartbeat is fast and slow, and the beat is not neat. Premature beats are basically benign and not dangerous. There are many reasons for premature beats, often due to smoking, drinking alcohol or strong tea or coffee, or not sleeping well at night. As long as there are no other diseases in the heart, premature beats may not require treatment. It is important to rest well, not to drink strong tea, not to drink alcohol, and to adjust your lifestyle well.