The difference between knocking and thumping.

The differences between these two idioms include different reasons and different descriptions.

For different reasons: "thumping" usually occurs when excited, anxious or nervous, and the heartbeat is fast and obvious, and sometimes the heartbeat can be heard; "Beating" is an irregular heartbeat caused by internal abnormalities such as heart disease, fatigue and anemia.

Different descriptions: "thumping" describes action and describes a person's inner anxiety or excitement; "Beating" refers to inner excitement, here refers to a strong heartbeat.