Proximate causation presupposes the existence of actual or but-for causation;you can't have the former without the latter.

Proximate Causation

A principle in law that establishes the legal cause of an event based on the foreseeability of the harm and a direct relation to the injury.

Actual Causation

The fact-based determination that a defendant's action was the direct cause of the plaintiff's injury.

But-For Causation

A principle in law that determines causality by asking whether the harm would not have occurred but for the defendant's actions.