Intervening Causes in Personal Injury Cases

Proving negligence in a personal injury claim requires more than showing that someone acted carelessly. The injured party must establish four key elements: that the defendant owed them a duty of care, that the defendant breached that duty, that the breach caused their injuries, and that actual damages resulted. Of these four, causation is often the most contested — and intervening causes are one of the primary ways defendants challenge it.

Understanding how intervening causes work gives injury victims and their attorneys a clearer picture of what to expect when liability is disputed. In Texas personal injury cases, the distinction between an intervening cause and a superseding cause can determine whether a defendant walks away from responsibility entirely — or whether they remain on the hook for the harm caused. For more on how these issues apply to specific accidents, see the personal injury resources here.

What Is an Intervening Cause?

An intervening cause is an event that occurs between the defendant’s negligent act and the plaintiff’s injury, breaking or disrupting the direct chain of causation. In other words, something happened after the defendant acted carelessly, and that something played a role in causing the injury.

For an event to qualify as an intervening cause, courts look at three requirements. First, the event must occur after the defendant’s negligent conduct. Second, it must occur before the plaintiff sustains the injury. Third, the event must have actually contributed to causing the harm.

Consider a straightforward example: a restaurant owner spills gasoline while refueling a generator in an alley and fails to clean it up. A kitchen employee goes out for a cigarette break and tosses a lit cigarette into the gasoline puddle, causing an explosion that injures a bystander. The employee’s act — tossing the cigarette — is an intervening cause. It happened after the owner’s negligence and before the injury, and it directly caused the explosion.

Here’s the critical point many people miss: the fact that an event qualifies as an intervening cause does not automatically release the original defendant from liability. The original negligent party may still bear legal responsibility, particularly if the intervening event was something a reasonable person could have anticipated.

Superseding Causes

For an intervening cause to actually absolve the defendant of liability, it must rise to the level of a superseding cause. A superseding cause meets all the requirements of an intervening cause but adds one additional element: the harm caused was not reasonably foreseeable to the original defendant.

The foreseeability requirement is what separates an intervening cause from a superseding cause. If the original defendant’s negligence created conditions that made the subsequent harmful event predictable — even broadly — the intervening cause likely will not be treated as superseding. The defendant remains liable because the chain of events was within the foreseeable risk created by their negligence.

Returning to the gasoline spill example: the restaurant owner left flammable liquid in an area where employees regularly go on breaks. It is entirely foreseeable that someone in that environment might carelessly ignite the spill. That foreseeability keeps the owner within the scope of liability despite the employee’s act being the direct cause.

Now change the facts. The gasoline forms a puddle in a crevice of the alley ground. Later, an unrelated violent crime occurs in the alley — the victim is beaten unconscious by assailants and falls face-first into the gasoline puddle, where they drown. Would a court consider this a superseding cause?

Almost certainly yes. When the owner spilled the gasoline, the foreseeable risk was fire — someone accidentally igniting flammable liquid. The possibility that a person would be rendered unconscious by a violent attack and drown in the puddle is so far outside the foreseeable risk that it breaks the chain of legal causation. A court would likely find this a superseding cause, relieving the original defendant of liability for the victim’s death.

Intentional Torts as Superseding Causes

There is an additional situation in which an intervening cause can relieve the original defendant of liability: when the intervening act is an intentional tort — meaning someone deliberately acted with the intent to cause harm.

Returning again to the gasoline scenario: if the kitchen worker, knowing the puddle was gasoline, intentionally threw a lit cigarette into it — not out of carelessness but with the deliberate intent to cause an explosion — the analysis shifts. Since gasoline’s combustibility is common knowledge, a court could reasonably conclude that throwing a lit cigarette into it was intended to cause the resulting harm. This transforms the worker’s act from a mere intervening cause into a superseding one, shifting full liability away from the restaurant owner and onto the worker.

The logic is straightforward: when someone steps in with deliberate, harmful intent, the law treats them as the true cause of the damage. The original negligent party’s responsibility is cut off, because the intentional wrongdoer introduced an entirely new and independent cause of harm.

What This Means for Your Personal Injury Case

Intervening and superseding cause arguments are most commonly raised as affirmative defenses — legal arguments the defendant makes to reduce or eliminate their liability even after the plaintiff has established the basic elements of negligence. These defenses require the defendant to prove that a third-party act or unforeseeable event was the real cause of the plaintiff’s injury.

As a plaintiff, your attorney’s job is to demonstrate that whatever intervening event occurred was either foreseeable or that the defendant’s negligence remained a substantial contributing factor in causing your harm. Texas courts look at the totality of the circumstances, including the nature of the original negligent act, what risks it created, and whether the chain of events leading to injury was within the range of what a reasonable person would have anticipated.

These are not simple arguments to win or defend against. The outcome often turns on expert testimony, detailed fact analysis, and a thorough understanding of Texas negligence law. Anyone facing these issues in a personal injury case should work with an attorney who has experience in contested liability cases.