Common law negligence is the body of judge-made rules that lets an injured person recover money from someone whose carelessness caused the harm, and it turns on four elements the plaintiff has to prove: a duty of care, a breach of that duty, causation, and actual damages. Each element is a separate hurdle, and missing any one of them ends the case. The rules grew out of centuries of court decisions rather than statutes, and they still form the backbone of personal injury litigation in every state.
Duty of Care
The first question in any negligence case is whether the defendant owed the plaintiff a duty to act carefully in the first place. This is a question of law, meaning the judge decides it, not the jury.1Legal Information Institute. Duty of Care If the judge rules no duty existed, the lawsuit ends before trial.
Duty turns on foreseeability. The test is whether a reasonable person in the defendant’s position could have anticipated that their conduct might injure someone like the plaintiff. The 1928 case Palsgraf v. Long Island Railroad Co. put it this way: “the risk reasonably to be perceived defines the duty to be obeyed.”2New York State Courts. Palsgraf v Long Island Railroad Co A duty runs to people in the foreseeable zone of risk created by the defendant’s conduct, and not to those outside it. A driver owes a duty to nearby motorists, pedestrians, and cyclists. The same driver does not owe a duty to a stranger watching traffic on a security feed across town.
Some relationships create a duty automatically. A doctor owes one to a patient, a business owner to customers on the premises, a landlord to tenants. Courts weigh the nature of the activity, the closeness of the relationship, and the probability of injury when deciding whether the duty existed. Property owners face their own version of this analysis, and traditional rules gave different levels of protection to invitees, licensees, and trespassers, though some states have replaced those categories with a single reasonable-care standard.
Breach and the Reasonable Person Standard
Once a duty exists, the next question is whether the defendant lived up to it. Courts measure conduct against the “reasonable person” standard: a hypothetical, ordinarily careful person facing the same situation.3Legal Information Institute. Reasonable Person The test is objective. It does not matter that the defendant thought their behavior was fine or lacked the experience to know better. What matters is what a reasonably careful person would have done.
Jurors weigh how likely the injury was, how severe it could have been, and how burdensome the precautions would have been. A property owner who ignores a rotting staircase for months when a small repair would have fixed it has plainly fallen below the standard. If the risk was obscure and guarding against it enormously costly, the calculus shifts. In specialized fields like medicine or engineering, the reasonable person becomes the reasonable professional, and expert testimony usually shapes the jury’s view of what care looked like.
Negligence Per Se
Some breaches prove themselves. When a defendant violates a specific safety statute, many courts treat the violation as automatic proof of breach under the doctrine of negligence per se.4Legal Information Institute. Negligence Per Se Two conditions apply: the statute must have been designed to prevent the type of harm that occurred, and the plaintiff must belong to the class of people the statute was meant to protect. A driver who runs a stop sign and hits a pedestrian meets both. The only questions left are causation and damages. Courts recognize narrow excuses, like an ambiguous statute or a situation where compliance would have been more dangerous than violation, but those are rare.
Causation
Showing the defendant was careless is not enough. The plaintiff also has to show that the carelessness actually produced the injury, which involves two separate tests.
Cause in Fact
The first test, often called the but-for test, asks whether the injury would have happened if the defendant had not been negligent.5Legal Information Institute. But-For Test If the answer is yes, the defendant’s conduct was not a necessary cause and the claim fails. A surgeon who leaves a sponge inside a patient passes this test easily. A doctor whose mistake affected a terminally ill patient who would have died on the same timeline anyway may not.
The test breaks down when two independent negligent acts combine to cause a single injury, because each defendant can point at the other. Most jurisdictions solve this through joint and several liability, holding all contributing parties responsible for the full amount of damages.5Legal Information Institute. But-For Test
Proximate Cause
Even when but-for causation is met, a defendant is not on the hook for every downstream consequence. Proximate cause limits liability to outcomes that bear a reasonable relationship to the negligent act. Courts look for a direct and natural sequence between the conduct and the injury. Bizarre, unforeseeable consequences fall outside that sequence.
Intervening events matter here. A foreseeable intervening event, like an ambulance getting into its own accident on the way to a crash scene, keeps the original defendant on the hook. A truly extraordinary and unforeseeable intervening event becomes a superseding cause that cuts off liability. Many negligence cases turn on which side of that line the intervening event falls.
The Eggshell Plaintiff Rule
A defendant takes the plaintiff as they find them. Under the eggshell skull rule, a defendant is liable for the full extent of the injuries even if a pre-existing condition made them far worse than expected. A negligent bump into someone with a brittle-bone condition that turns a minor collision into a serious fracture leaves the defendant responsible for the fracture, not just the bruise a healthier person would have suffered. Courts consistently reject the argument that the pre-existing condition, rather than the defendant’s conduct, is the real cause.
Res Ipsa Loquitur
Sometimes the accident itself is strong enough evidence of negligence that the plaintiff does not have to pinpoint exactly what went wrong. Res ipsa loquitur, Latin for “the thing speaks for itself,” creates an inference of negligence when the accident is the kind that does not normally happen without carelessness, the instrument was under the defendant’s exclusive control, and the plaintiff did not contribute to the cause.6Legal Information Institute. Res Ipsa Loquitur The classic example is a surgical sponge left inside an unconscious patient. That combination shifts the burden to the defendant to explain what happened.
Damages You Can Recover
A negligence claim without provable harm goes nowhere. Even obvious carelessness will not carry a case if the plaintiff cannot show actual injury. Damages fall into several categories, and each has its own documentation requirements.
Special Damages
Special damages cover losses with a specific dollar value: medical bills, lost wages, property repair costs, and similar out-of-pocket expenses.7Legal Information Institute. Special Damages Receipts prove these. A $25,000 surgery bill, $1,500 in prescriptions, and $10,000 in lost salary are all special damages. Future economic losses count too, but they need supporting evidence like a physician’s opinion on necessary future treatment or an economist’s projection of lost earning capacity. Courts do not accept speculation.
General Damages
General damages compensate for harm without a price tag: pain, emotional distress, loss of enjoyment of life, disfigurement. Juries have wide discretion, guided by the severity and permanence of the injury. A permanent back injury that limits daily activities might produce a general damage award ranging from $50,000 to several hundred thousand dollars depending on the jurisdiction and the evidence. Photographs, family testimony about how the plaintiff’s life has changed, and medical reports all help the jury put a number on inherently subjective losses.
About a dozen states impose statutory caps on non-economic damages, with limits typically between $250,000 and $650,000 depending on the type of case. Other states have no caps at all. That difference can dramatically change the value of an identical injury in different parts of the country.
Punitive Damages
Punitive damages go beyond compensation. They exist to punish especially harmful behavior and discourage others from doing the same.8Legal Information Institute. Punitive Damages Courts reserve them for conduct that rises well above ordinary carelessness, typically requiring proof of intentional wrongdoing or reckless, conscious disregard for other people’s safety. Ordinary negligence does not qualify no matter how clear. Most jurisdictions require the plaintiff to prove entitlement to punitive damages by clear and convincing evidence, a higher bar than the preponderance standard used for the rest of the case.
The U.S. Supreme Court has placed constitutional limits on punitive awards. In BMW of North America, Inc. v. Gore, the Court struck down a punitive award with a 500-to-1 ratio to actual damages, signaling that grossly disproportionate punitive awards violate due process.9Oyez. BMW of North America Inc v Gore Later decisions reinforced that single-digit ratios between punitive and compensatory damages are more likely to survive constitutional scrutiny.
The Duty to Mitigate
Injured plaintiffs cannot sit back and let their losses pile up. The law imposes a duty to mitigate, meaning you must take reasonable steps to minimize the harm caused by someone else’s negligence.10Legal Information Institute. Duty to Mitigate If a doctor recommends physical therapy to prevent a minor injury from becoming a permanent disability, refusing that treatment without good reason can reduce or eliminate recovery for the additional harm. The key word is “reasonable.” No one is expected to undergo risky surgery or spend money they do not have. But ignoring straightforward, affordable steps to get better will cost you at trial.
The Standard of Proof
Negligence is a civil claim, not a criminal charge, and the proof requirement is much lower. A plaintiff has to establish each element by a preponderance of the evidence, which essentially means “more likely than not.” That is far less demanding than the “beyond a reasonable doubt” standard in criminal cases. A defendant acquitted of reckless driving can still lose a civil negligence lawsuit arising from the same accident, because the two proceedings use entirely different measuring sticks.
Defenses That Can Reduce or End a Claim
Even when a plaintiff proves all four elements, a defendant can raise an affirmative defense to cut down or wipe out liability. These defenses do not deny the negligence; they argue that the plaintiff shares blame or accepted the risk.
Comparative Negligence
Most states use some form of comparative negligence, which reduces the plaintiff’s recovery in proportion to their own fault. The system comes in two flavors. Under pure comparative negligence, you can recover damages even if you were 99% at fault, though your award reflects only the defendant’s share. Under modified comparative negligence, you lose the right to recover once your fault reaches a threshold, either 50% or 51% depending on the jurisdiction.11Legal Information Institute. Comparative Negligence The practical difference is significant. In a modified system, an adjuster who can push your assigned fault past the threshold zeros out the claim.
Contributory Negligence
A handful of states, including Maryland, Virginia, Alabama, and North Carolina, follow the older and harsher rule of contributory negligence.12Legal Information Institute. Contributory Negligence A plaintiff who bears any fault at all, even 1%, recovers nothing. The severity of this rule produced a safety valve called the last clear chance doctrine, which allows a negligent plaintiff to recover if the defendant had the final opportunity to avoid the accident and failed to take it.13Legal Information Institute. Last Clear Chance If you are injured in one of these states, expect the defense to look hard for any evidence you contributed to your own harm. Even small details like jaywalking can be fatal to a claim.
Assumption of Risk
A defendant can also argue the plaintiff knowingly accepted the danger. Express assumption of risk involves a signed waiver, like the release form before bungee jumping or joining a gym. If the waiver is not against public policy, it typically bars recovery for the injuries it covers. Implied assumption of risk arises from conduct rather than paperwork. Someone who joins a recreational basketball game has implicitly accepted the risk of being elbowed or tripped, because those risks are inherent to the activity.14Legal Information Institute. Assumption of Risk In most modern jurisdictions, implied assumption of risk is folded into the comparative negligence analysis rather than treated as a complete bar.
When Someone Else Pays: Vicarious Liability
The person who caused the injury is not always the only one who pays. Under the doctrine of respondeat superior, an employer can be held liable for the negligent acts of an employee, as long as the employee was acting within the scope of the job when the harm occurred.15Legal Information Institute. Respondeat Superior A delivery driver who runs a red light while making a delivery creates liability for both the driver and the delivery company, regardless of how closely the employer was supervising at the moment.
The doctrine does not reach independent contractors. Courts distinguish employees from contractors by examining how much control the hiring party exercises over the details of the work, whether the worker uses their own tools, whether they set their own hours, and whether the work is part of the hiring party’s regular business.15Legal Information Institute. Respondeat Superior That distinction often determines whether a claim targets an individual with limited assets or a company with insurance and deep pockets. Courts will sometimes look past a contractor label if the substance of the relationship looks like employment.
When the Victim Died: Wrongful Death
When negligence kills someone, the victim cannot sue. Every state closes that gap through a wrongful death statute allowing surviving family or dependents to bring a claim on the deceased’s behalf.16Legal Information Institute. Wrongful Death These statutes vary, but generally spouses, children, and sometimes parents or siblings can recover for lost financial support, funeral costs, and the emotional harm of the death. Juries look at the deceased’s income, expected future earnings, and how much surviving family depended on them.
Wrongful death claims use the same four elements as any other negligence case. The plaintiff has to show duty, breach, causation, and damages. Awards can be substantial when the deceased was a primary earner with young dependents, and some states allow punitive damages where the underlying conduct was intentional or reckless.
Filing Deadlines
Every negligence claim has a deadline. Statutes of limitations set a window, typically between one and six years from the date of injury, during which the plaintiff must file suit. Most states set the limit at two or three years for personal injury claims. Miss that window and the court will almost certainly dismiss the case, no matter how strong the evidence.
Several exceptions can pause or extend the clock. The discovery rule delays the start of the limitations period when an injury is not immediately apparent; it begins running from the date the plaintiff knew or should have known about the harm. Minors generally get additional time, with the clock often starting on their eighteenth birthday rather than the date of injury. Mental incapacity at the time of the injury can also toll the deadline until the person regains capacity. These extensions are not automatic and often require a court ruling, so treat any assumption that the clock is paused as something to confirm rather than rely on.