Governing Concept
Proximate cause is the adequate, efficient, and natural cause that produces the injury in a continuous sequence, unbroken by an efficient intervening cause, and without which the injury would not have occurred.
In negligence and quasi-delict, liability is not imposed merely because a person acted carelessly; the negligent act or omission must be legally connected to the damage suffered.
The Civil Code concept of quasi-delict requires fault or negligence that causes damage to another, so causation is a necessary link between breach of duty and compensable injury.
Proximate cause limits liability to consequences that are the natural and probable result of the negligent act and that a prudent person could reasonably foresee in light of the surrounding circumstances.
The inquiry is not whether the negligent act was the nearest cause in time or place, but whether it was a substantial and legally operative cause of the injury.
A remote cause supplies only a background condition, while a proximate cause has an active causal force that naturally leads to the harmful result.
Cause in fact asks whether the injury would have occurred without the act or omission; proximate cause asks whether the law treats that factual cause as sufficiently direct, foreseeable, and substantial to justify liability.
A defendant's negligence may be a proximate cause even if other circumstances helped produce the damage, because the law recognizes that several causes may combine to bring about one injury.
Where two or more negligent acts concur as proximate causes of one damage, each wrongdoer may be answerable for the whole injury under the Civil Code rule on solidary liability for joint quasi-delicts.
Intervening Cause
An intervening cause is a force, act, event, or omission that arises after the defendant's negligent conduct and contributes to the production of the injury.
An intervening cause matters because it may either leave the original negligence legally operative or cut off liability by becoming the new proximate cause of the damage.
The mere fact that another event occurs after the original negligence does not automatically break the chain of causation.
The controlling question is whether the later event was a normal, foreseeable, or risk-related consequence of the original negligence, or whether it was independent, unforeseeable, and sufficient by itself to produce the injury.
If the intervening act is reasonably foreseeable or is one of the hazards that made the original conduct negligent, the original negligence remains a proximate cause.
If the intervening act is independent of the original negligence, not reasonably foreseeable, and adequate by itself to produce the injury, it is an efficient intervening cause that supersedes the earlier negligence.
A superseding cause is therefore a particular kind of intervening cause: it is an intervening cause with legal effect sufficient to break the causal chain.
Distinction
| Point of Comparison | Proximate Cause | Intervening Cause |
|---|---|---|
| Function | Identifies the legally responsible cause of the injury. | Tests whether a later event changes or ends the legal effect of an earlier negligent act. |
| Timing | May occur before, during, or as part of the chain producing the damage. | Arises after the initial negligent act or omission. |
| Legal effect | Creates liability when joined with duty, breach, damage, and the required proof. | May preserve, reduce, shift, or extinguish liability depending on its character. |
| Foreseeability | Requires a natural and probable connection between negligence and injury. | Breaks the chain only when it is extraordinary, independent, and not reasonably foreseeable. |
| Relation to other causes | Can coexist with concurrent proximate causes. | Can be merely contributory, concurrent, or superseding. |
| Effect on defendant | Keeps the defendant within the scope of legal responsibility. | Releases the defendant only if it becomes the sole efficient cause of the injury. |
When an Intervening Cause Does Not Break Causation
An intervening event does not defeat liability when it is a foreseeable response to the danger created by the original negligence.
Rescue efforts, emergency reactions, and attempts to avoid harm are ordinarily foreseeable when a negligent act creates imminent peril.
The original wrongdoer remains liable for injuries that naturally flow from the danger, including injuries sustained in reasonable efforts to escape, rescue, or mitigate the threatened harm.
Negligence of another person does not necessarily supersede the first negligence when both negligent acts operate together to produce the same damage.
A later negligent act is not superseding when the original negligence increased the risk that the later act would occur or made the victim vulnerable to that later act.
Ordinary medical treatment following an injury is generally treated as a foreseeable consequence of the original harm, so later complications from normal treatment do not automatically cut off the original tortfeasor's liability.
A foreseeable act of a third person remains within the scope of risk when the defendant's duty includes guarding against that type of conduct.
A natural condition or environmental event does not supersede negligence when the defendant's conduct exposed the victim to the very danger that the condition made harmful.
The original negligence continues to be proximate when the later event merely accelerates, aggravates, or combines with the risk already created.
When an Intervening Cause Becomes Superseding
An intervening cause becomes superseding when it is so independent and unexpected that the injury can no longer be fairly attributed to the original negligence.
The later event must be sufficient by itself to produce the damage, because a cause that merely contributes to an existing causal chain does not displace the original proximate cause.
The more extraordinary the later act, the stronger the basis for treating it as a superseding cause.
A deliberate criminal act by a third person may supersede prior negligence when the criminal act was not reasonably foreseeable and the defendant had no duty to anticipate or guard against it.
The same criminal act does not supersede prior negligence when the defendant's duty specifically includes precautions against that kind of intentional misconduct.
A fortuitous event may break the chain when it is the sole proximate cause of the damage and the defendant's negligence neither contributed to the event nor exposed the victim to its effects.
A fortuitous event does not relieve a negligent actor when the actor's prior negligence made the harm possible or aggravated the injury in a way that ordinary prudence should have anticipated.
Extraordinary medical malpractice or a wholly independent act of gross negligence may become superseding when it produces a distinct injury not naturally flowing from the original harm.
The practical line is whether the later event is a new source of danger or only the unfolding of the danger created by the original negligence.
Foreseeability and Scope of Risk
Foreseeability in proximate cause does not require prediction of the exact manner of injury, the precise extent of damage, or the specific person ultimately harmed.
It is enough that the general kind of harm was a natural and probable consequence of the negligent conduct.
The defendant may remain liable even if the injury occurs through an unusual sequence, provided the sequence is not so extraordinary as to be outside ordinary human experience.
The scope of risk approach asks whether the injury belongs to the class of harms that made the defendant's conduct negligent in the first place.
If the later event falls within that class of risks, it is not a superseding cause even if it occurs after the defendant's act.
If the later event creates a different and unrelated risk, it may become the effective legal cause of the damage.
Foreseeability is judged from the standpoint of a reasonably prudent person at the time of the negligent conduct, not with the perfect clarity supplied by hindsight.
Intervening Acts of the Injured Party
The injured party's own act may be an intervening cause when it occurs after the defendant's negligence and contributes to the injury.
If the injured party's negligence is the immediate and proximate cause of the injury, recovery is barred because the defendant's negligence is no longer the legal cause of the damage.
If the injured party's negligence is only contributory, the Civil Code allows recovery but authorizes mitigation of damages according to the circumstances.
A victim's reasonable effort to escape danger is not treated as superseding negligence merely because it worsens the injury.
A victim's unreasonable, deliberate, and unforeseeable exposure to a new danger may break the chain if it becomes the sole efficient cause of the damage.
The distinction turns on whether the victim's act is a normal reaction to the risk created by the defendant or an independent decision that creates a separate danger.
Multiple Causes and Allocation of Responsibility
Proximate cause does not demand a single cause, because legal causation can rest on concurrent causes that operate at the same time or in sequence.
When separate negligent acts are each substantial factors in producing one indivisible injury, each actor's negligence may be treated as a proximate cause.
An intervening act that is also negligent may be a concurrent proximate cause rather than a superseding cause.
Concurrent causation supports liability against all responsible actors when the injury would not have occurred in the same way without their combined negligence.
Superseding causation shifts responsibility only when the later cause is legally sufficient to stand alone as the cause of the harm.
The presence of a later actor does not erase the earlier actor's liability when the earlier negligence set in motion the sequence that naturally and probably produced the injury.
Proof and Legal Consequences
The claimant must prove by preponderance of evidence that the defendant's negligent act or omission was a proximate cause of the injury.
Proof of negligence without proof of causal connection establishes no liability for damages.
Proof of injury without proof that the defendant's negligence produced it likewise fails, because damages in quasi-delict compensate legally attributable harm.
The defendant may avoid liability by showing that an efficient intervening cause, and not the defendant's conduct, was the true proximate cause of the injury.
The defendant may reduce liability by showing that the injured party's own negligence contributed to the damage without being the sole proximate cause.
The court determines proximate cause from the totality of facts, including the character of the negligent act, the sequence of events, the foreseeability of the harm, and the independence of any later cause.
Proximate cause is ultimately a legal conclusion drawn from facts, because it fixes the boundary between factual causation and compensable responsibility.