A premature heart beat (contraction) is a type of arrhythmia. It is a beat that occurs earlier than expected, briefly interrupting the normal heart rhythm. A premature heart beat is often described as a "thump" in the chest. However, this "missed beat" sensation does not reflect the premature contraction, but rather the forceful beat that follows the pause after the premature beat. The heart fills with blood during this pause, making the next beat more forceful. Premature beats that occur in the atria (upper chambers of the heart) are called premature atrial contractions, or PACs. Premature beats that occur in the ventricles (lower chambers) are called premature ventricular contractions, or PVCs.

Symptoms based on different types of syndrome in TCM
1. Deficiency of Heart and Spleen
Main symptoms: Neurosis, impotence, emaciation, fatigue, pale complexion, palpitations, insomnia, forgetfulness, indigestion, pale and greasy tongue coating, weak pulse.

2. Deficiency of Kidney Qi and Yang
Main symptoms: Impotence, sore back, hair loss, loose teeth, senility, pale tongue coating, weak pulse

3. Liver and Spleen Imbalances
Main symptoms: Fatigue, pale complexion, palpitations, indigestion, poor memory, choking sensation in chest, aversion to cold, swellings, deep pulse.