Cause in Fact (Actual Cause)
- This refers to a direct, factual connection between the defendant’s act and the plaintiff’s injury.
- A common test for cause in fact is the “but-for” test: But for the defendant’s conduct, would the injury have occurred?
- Example: A driver runs a red light and hits a pedestrian. The pedestrian would not have been hit but for the driver’s action.
Proximate Cause (Legal Cause)
- This limits liability to harms that are sufficiently foreseeable and directly related to the defendant’s actions.
- Courts often use the “foreseeability test” to determine whether the harm was a natural and probable consequence of the defendant’s conduct.
- Example: A driver runs a red light, causing another car to swerve and hit a utility pole, knocking out power to a hospital, leading to a patient’s death. The proximate cause argument would focus on whether the power outage and patient’s death were a foreseeable result of the driver’s negligence.
The most universal definition of proximate cause in law is: “A cause that is legally sufficient to result in liability; an act or omission that is a substantial factor in bringing about the harm and is not so remote or unforeseeable that it relieves the defendant of responsibility.”
In simpler terms, proximate cause means that the defendant’s actions were closely connected to the injury and that the harm was a foreseeable result of those actions. It limits liability to consequences that are directly related to the wrongful act, rather than those that are too indirect or unexpected.
Key Difference
- Cause in fact is about actual causation—did the defendant’s action set off the chain of events leading to harm?
- Proximate cause is about legal responsibility—was the harm a foreseeable and direct result of the defendant’s action, or was it too remote?
Courts use proximate cause to prevent defendants from being held liable for every consequence of their actions, no matter how distant or unexpected.