Examples of proximate cause in personal injury cases usually fall into a few recognizable patterns: the obvious ones where a careless act produces exactly the harm you would expect, the stretched ones where the chain of events takes an odd detour, and the edge cases involving rescuers, unusually fragile victims, or freak intervening events. Proximate cause is the legal limit on how far a defendant’s liability reaches after a negligent act, and it turns almost entirely on foreseeability: was the harm the kind of thing a reasonable person would have anticipated from the conduct?
The Straightforward Examples
The easiest cases are the ones where the injury is exactly what you would expect from the careless act. A driver blows through a red light and strikes a pedestrian in the crosswalk. The negligent act is ignoring the signal. The foreseeable risk is a collision with cross-traffic or a pedestrian. The actual harm, broken bones and medical bills, matches that foreseeable risk precisely. Courts do not struggle with these.
Slip-and-fall claims work the same way. A property owner knows a refrigerator is leaking and leaves the slick floor unmarked for hours. A customer walks through and fractures a hip. The broken hip is the natural result of the hazard the owner failed to fix, and it is exactly the kind of harm a wet, unmarked floor produces. Jurors grasp the connection immediately, and proximate cause is rarely contested.
The pattern in each of these examples is the same. The type of harm that occurred matches the type of risk the negligence created. When those two line up, proximate cause is satisfied without much fuss.
When the Chain of Events Takes a Detour
Proximate cause becomes interesting when the sequence gets strange. Suppose a contractor negligently leaves a trench uncovered on a sidewalk. A cyclist swerves to avoid it, crashes into a parked car, and the car alarm startles a nearby dog that bites a child. The contractor’s negligence factually caused every link in that chain. But most courts would say the dog bite is too remote and unpredictable to fall within the scope of the risk the contractor created. The cyclist’s own injuries from the crash? Foreseeable. The dog bite to the child down the sidewalk? That is where courts typically cut off liability.
The dividing line is whether a reasonable person in the defendant’s position could have anticipated that this kind of injury might result. A driver who runs a red light can foresee hitting a pedestrian. That same driver cannot foresee that the collision will cause a bystander six blocks away to faint from shock and fracture her wrist. The pedestrian is within the scope of the risk. The distant bystander probably is not.
Palsgraf: The Textbook Example
No example is more famous than the 1928 New York Court of Appeals decision in Palsgraf v. Long Island Railroad Co. Two men ran to catch a moving train. One boarded without trouble. The other, carrying a small newspaper-wrapped package about fifteen inches long, jumped for the car and looked unsteady. A train guard on the car reached out to pull him in while another guard on the platform pushed him from behind. The jostling knocked his package loose, and it fell onto the tracks. The package turned out to contain fireworks and exploded on impact. The shockwave from the explosion toppled a set of heavy scales at the far end of the platform, and those scales struck Mrs. Palsgraf, injuring her.1New York State Courts. Palsgraf v Long Is. R.R. Co.
Chief Judge Benjamin Cardozo, writing for the majority, ruled against Mrs. Palsgraf on foreseeability grounds. The guards’ conduct might have been careless toward the man with the package, but nothing about the situation suggested any risk to someone standing far down the platform. The package looked ordinary. Nobody could have known it held explosives. Cardozo wrote that “nothing in the situation gave notice that the falling package had in it the potency of peril to persons thus removed.”1New York State Courts. Palsgraf v Long Is. R.R. Co.
Cardozo framed the rule this way: “The risk reasonably to be perceived defines the duty to be obeyed, and risk imports relation; it is risk to another or to others within the range of apprehension.” Because Mrs. Palsgraf stood outside that range, the railroad owed her no duty at all.1New York State Courts. Palsgraf v Long Is. R.R. Co.
The Andrews Dissent
Justice Andrews dissented, and many jurisdictions have found his approach more workable. Andrews argued that once a defendant acts negligently toward anyone, the defendant owes a duty to everyone harmed as a result. For him, proximate cause was not really about foreseeability but about “practical politics,” a rough judgment about how far to trace a chain of consequences before common sense says to stop. He wrote that there are “no fixed rules to govern our judgment.”1New York State Courts. Palsgraf v Long Is. R.R. Co.
The split still shapes modern tort law. Some courts follow Cardozo and ask whether the plaintiff was within the foreseeable zone of danger. Others follow Andrews and allow a broader inquiry into whether the harm, however unusual, was a direct enough consequence to justify liability. Which framework your state uses can decide whether a case survives.
Rescuers Injured Trying to Help
One of the more counterintuitive examples involves people hurt while attempting a rescue. If a defendant’s negligence puts someone in danger and a bystander rushes in to help, the defendant is liable for the rescuer’s injuries too. When you create a dangerous situation, it is foreseeable that someone will try to fix it.
The rule traces to another Cardozo opinion, Wagner v. International Railway Co., decided in 1921. A train passenger was thrown from a car because of the railroad’s negligence, and his cousin was injured while searching for him on a dark trestle. Cardozo ruled for the rescuer with a line that became one of tort law’s most quoted: “Danger invites rescue. The cry of distress is the summons to relief.” He held that the law recognizes these reactions as normal and places “their effects within the range of the natural and probable.”2Justia Law. Wagner v International Ry. Co.
Car accidents, building fires, workplace injuries: any situation where negligence puts someone at risk can generate a second claim from whoever gets hurt trying to help. Courts also give rescuers significant leeway, recognizing that people making split-second decisions under pressure will not always choose the safest path.
The Eggshell Skull Example
Foreseeability governs the type of harm a defendant pays for, but it does not limit the severity. Under the eggshell skull doctrine, sometimes called the thin skull rule, a defendant takes the victim as they find them. If the type of injury is foreseeable but the plaintiff happens to be unusually vulnerable, the defendant pays for all of the actual damage.
A fender-bender at five miles per hour would leave most people with mild soreness. But if the other driver has a rare bone condition and the low-speed impact fractures their skull, the at-fault driver is liable for the full cost of treating that fracture. The defendant cannot argue that a normal person would have walked away fine. One of the earliest American cases applying this rule, Vosburg v. Putney in 1893, involved an eleven-year-old who lightly kicked a classmate’s shin at school. The classmate had a prior injury still healing in that spot, the kick reactivated an infection, and the classmate ultimately lost the use of his leg. The court held the kicker liable for all of it.
The doctrine also applies when negligence aggravates a pre-existing condition. If chronic back pain becomes disabling after a car accident, the at-fault driver is responsible for the aggravation. Insurance companies routinely argue that the plaintiff’s problems are pre-existing rather than caused by the crash. The eggshell skull rule cuts against that defense: as long as the defendant’s negligence made your condition worse, the defendant pays for the worsening, regardless of your baseline health.
Superseding Causes That Break the Chain
Some examples run the other direction, where an extraordinary intervening event cuts off liability that would otherwise attach. These are called superseding causes. They relieve the original defendant because the intervening event is so unforeseeable that it, rather than the negligence, becomes the legal cause of the harm.
Consider a homeowner who negligently leaves a fire burning in a backyard pit. The foreseeable risk is that sparks could reach the fence or a neighbor’s yard. If a once-in-a-century hurricane sweeps through and carries the embers three blocks away, the hurricane is a superseding cause. No reasonable person would anticipate that particular sequence, and the law does not hold the homeowner responsible for damage caused by the combination of ordinary negligence and an extraordinary natural disaster.
The dividing line is foreseeability again. A reasonably predictable intervening event does not break the chain. If you leave your car unlocked in a high-crime area with the keys in the ignition and someone steals it and injures a pedestrian, most courts will say the theft was foreseeable enough that your negligence remains a proximate cause of the pedestrian’s injuries. But if you leave your car unlocked in a gated suburban driveway and a stranger hot-wires it for a joyride, the criminal act is more likely to qualify as a superseding cause that ends your liability.
Criminal acts by third parties sit on this spectrum. A bar that continues serving a visibly intoxicated patron who then assaults another customer faces a strong argument that the assault was a predictable consequence of over-serving. A landlord who fails to fix broken locks in a building with a known pattern of break-ins may be liable when a burglary injures a tenant. In each example, the question is whether the negligence made the crime more likely.
When Your Own Negligence Is Also a Proximate Cause
Examples get more complicated when the plaintiff’s own carelessness contributed to the injury. States handle this differently, and the approach can mean the difference between full compensation, a reduced award, or nothing at all.
A small number of states still follow contributory negligence, under which any fault on the plaintiff’s part, even one percent, bars recovery entirely. A jaywalking pedestrian hit by a speeding driver could recover nothing under that rule because the pedestrian’s own negligence also contributed. Most states have moved away from this harsh approach.
The majority use some form of comparative negligence, which reduces recovery by the plaintiff’s percentage of fault rather than eliminating it. Under pure comparative negligence, a plaintiff found 80% responsible still collects 20% of the damages. Under modified comparative negligence, recovery is barred once the plaintiff’s share hits a threshold of either 50% or 51%, depending on the state. In modified systems, a plaintiff at 49% fault still recovers, though the award is cut nearly in half, while a plaintiff at 51% recovers nothing.
The reason this fits into a discussion of proximate cause is that juries often decide two causation questions at once: whether the defendant’s negligence was a proximate cause of the harm, and whether the plaintiff’s own negligence was also a proximate cause. When both answers are yes, the state’s comparative fault rules determine how the loss gets split.