You’re staring at an MBE fact pattern where a defendant’s negligence clearly caused an injury. You’ve nailed duty and breach. You’ve connected actual causation. Then the facts throw in a freak coincidence, an intervening criminal act, or a bizarre chain of events — and suddenly you’re second-guessing everything. Welcome to proximate cause, the element that turns straightforward negligence questions into mental gymnastics.
Proximate cause on the MBE isn’t about tracing every link in the causal chain. It’s about drawing a line where the law says “enough.” The defendant’s liability doesn’t extend infinitely just because their carelessness set events in motion. Understanding when that line gets drawn — and when an intervening force breaks the chain — is the difference between picking the right answer and falling for a distractor.
What Proximate Cause Actually Means
Proximate cause (also called legal cause) asks whether the harm that occurred was a foreseeable result of the defendant’s negligent conduct. This is distinct from actual cause, which asks whether the defendant’s conduct was a factual cause of the harm (the “but for” test). You can have actual cause without proximate cause.
The test is foreseeability. Did the type of harm that occurred fall within the scope of risks that made the defendant’s conduct negligent in the first place? Notice the emphasis on type of harm, not the exact manner or extent. The defendant doesn’t need to foresee the precise chain of events — just that harm of this general kind could result.
Here’s the key distinction the MBE loves to test: The defendant is liable for foreseeable consequences of their negligence, even if those consequences occur in an unforeseeable manner. A defendant who negligently starts a fire is liable when the fire spreads to a neighboring building, even if the fire jumped across a gap in a freakish way no one could have predicted. Fire damage to nearby property is a foreseeable type of harm from starting a fire negligently.
But if the negligent fire causes a bystander to panic, run into the street, and get hit by a car three blocks away, you’re approaching the outer limits of proximate cause. The type of harm (traffic accident far from the fire scene) is sufficiently unrelated to the risk that made starting the fire negligent.
The Eggshell Plaintiff Rule and Proximate Cause
Before diving into superseding causes, clarify one doctrine that confuses students: the eggshell plaintiff rule. You take your plaintiff as you find them. If the defendant negligently bumps into someone who has a rare bone disorder and causes catastrophic injuries, the defendant is liable for the full extent of those injuries — even though a normal person would have suffered only a bruise.
This seems to contradict foreseeability, but it doesn’t. The type of harm (physical injury from impact) was foreseeable. The extent was not, but that doesn’t matter. Proximate cause focuses on whether the general type of harm was foreseeable, not its severity. The eggshell plaintiff rule addresses damages, not whether proximate cause exists in the first place.
The MBE will give you a fact pattern where a minor collision causes unexpectedly severe injuries due to a preexisting condition. The defendant is liable. The analysis stops there. Don’t overthink it.
Superseding Causes: When the Chain Breaks
An intervening cause is an event that occurs after the defendant’s negligent act and contributes to the plaintiff’s injury. Not every intervening cause breaks the chain of proximate causation. Only a superseding cause does.
A superseding cause is an intervening force that is unforeseeable and sufficient to override the defendant’s liability. When an intervening cause is superseding, it becomes the legal cause of the harm, and the original defendant is off the hook for proximate cause (though actual cause still exists).
The critical question: Was the intervening force foreseeable? If yes, it’s not superseding — the defendant remains liable. If no, it may be superseding, depending on how extraordinary it was.
Foreseeable Intervening Causes
These are dependent intervening forces — they arise in response to the defendant’s negligence. They do not break the chain. Common examples the MBE tests:
Negligent medical treatment. The defendant negligently injures the plaintiff, who goes to the hospital and receives negligent medical care that worsens the injury. The original defendant remains liable for the full extent of the harm. Medical malpractice in treating an injury is foreseeable — people get treated after being injured.
Rescue efforts. A rescuer is injured while attempting to save someone endangered by the defendant’s negligence. The defendant is liable to the rescuer. Rescue attempts are foreseeable responses to danger. This includes professional rescuers (firefighters, EMTs) and bystanders. The “rescue doctrine” treats the rescuer as a foreseeable plaintiff.
Subsequent disease or accident. The defendant’s negligence leaves the plaintiff weakened or immobile, and the plaintiff contracts pneumonia or suffers a further accident due to their weakened state. The original defendant remains liable. These are normal risks that flow from being injured.
Reactions to danger. A plaintiff who is placed in danger by the defendant’s negligence and injures themselves trying to escape (jumping from a moving vehicle, fleeing a fire) can hold the defendant liable. Panic and self-preservation are foreseeable.
The MBE loves testing negligent medical treatment. The fact pattern will make the doctor’s error sound egregious. Ignore that. Unless the medical negligence is so extraordinarily reckless that it’s unforeseeable (intentional harm, gross deviation from any accepted practice), it doesn’t cut off the original defendant’s liability.
Unforeseeable Intervening Causes (Potentially Superseding)
These are independent intervening forces — they operate independently of the defendant’s negligence. They may break the chain if sufficiently unforeseeable.
Intentional criminal acts or torts by third parties. Generally, a third party’s intentional criminal act is unforeseeable and superseding — unless the defendant’s negligence created a situation that made such acts foreseeable. If the defendant negligently leaves a loaded gun accessible and a child picks it up and shoots someone, the criminal act doesn’t supersede because the defendant’s negligence created the very risk that made the crime possible.
But if the defendant negligently blocks a sidewalk, forcing pedestrians into the street, and a passing driver intentionally swerves to hit one of them, the intentional act is superseding. The defendant didn’t create a risk of intentional violence.
Extraordinary acts of nature. A truly extraordinary and unforeseeable natural event (not just bad weather) may be superseding. But if the defendant’s negligence leaves the plaintiff in a position of increased vulnerability to natural forces, the defendant may still be liable. The defendant who negligently leaves someone stranded on a mountain is liable when a snowstorm hits, even if the storm was unusual. The negligence created the vulnerability.
Gross negligence or intentional acts by the plaintiff. If the plaintiff’s own conduct is so extreme that it’s unforeseeable, it may break the chain. But this is rare. Ordinary contributory negligence by the plaintiff doesn’t cut off proximate cause — it’s addressed under comparative fault principles.
A Hypothetical the MBE Would Test
Defendant negligently runs a red light and crashes into Plaintiff’s car. Plaintiff suffers a broken leg and is taken to the hospital by ambulance. On the way to the hospital, the ambulance is struck by a drunk driver, and Plaintiff suffers additional injuries. Is Defendant liable for the injuries caused by the second collision?
Yes. The ambulance accident is an intervening cause, but it’s not superseding. It’s foreseeable that an injured person will be transported for medical care, and it’s foreseeable that accidents can occur during transport. The fact that the second driver was drunk doesn’t make the event so extraordinary that it breaks the chain. Defendant remains liable for all injuries.
Now change the facts: On the way to the hospital, a meteor strikes the ambulance. Is Defendant liable for those injuries?
No. A meteor strike is an extraordinary, unforeseeable act of nature — a superseding cause. The original defendant’s negligence did not create a risk that made meteor strikes more likely. This is the rare case where the intervening force is so bizarre that proximate cause is cut off.
The line between these scenarios is foreseeability. Traffic accidents during transport? Foreseeable. Meteor strikes? Not foreseeable.
Direct Cause vs. Indirect Cause
Some MBE questions test whether the defendant’s negligence directly caused the harm or set in motion a chain of events. The distinction matters less than you think. As long as the harm was a foreseeable result of the risk created by the defendant’s negligence, proximate cause exists — even if the causal chain involves multiple steps.
The defendant who negligently spills oil on a staircase is liable when someone slips, falls down the stairs, and crashes through a window at the bottom. The window damage is a foreseeable result of someone falling on a slippery staircase, even though the defendant didn’t directly break the window.
Focus on the risk analysis: What risk made the defendant’s conduct negligent? Did the harm that occurred fall within that risk? If yes, you have proximate cause, regardless of how many intermediate steps occurred.
How the MBE Tests This
The MBE proximate cause question typically follows this structure:
- Clear negligence by the defendant (duty, breach, and actual cause are not in dispute)
- An intervening event occurs (medical error, third-party act, natural event, plaintiff’s reaction)
- The question asks whether the defendant is liable for the resulting harm
The wrong answers will tempt you with:
- Actual cause confusion: “The defendant’s negligence was not the cause of the harm.” Wrong. Actual cause exists; the issue is proximate cause.
- Eggshell plaintiff misapplication: “The harm was unforeseeable because of the plaintiff’s unusual condition.” Wrong. You take the plaintiff as you find them.
- Foreseeability of manner: “The defendant could not have foreseen this exact sequence of events.” Wrong. The exact manner need not be foreseeable — only the type of harm.
The right answer will focus on whether the type of harm was within the scope of the foreseeable risk created by the defendant’s negligence, and whether any intervening force was so unforeseeable that it should be deemed superseding.
What You Need to Memorize
For the MBE, lock in these rules:
Proximate cause exists when the harm is a foreseeable result of the risk that made the defendant’s conduct negligent. Foreseeability focuses on the type of harm, not the exact manner or extent.
The eggshell plaintiff rule: The defendant is liable for the full extent of the plaintiff’s injuries, even if the severity was unforeseeable due to a preexisting condition.
Intervening causes are not automatically superseding. They break the chain only if they are unforeseeable and independent of the defendant’s negligence.
Foreseeable intervening forces (dependent forces): Negligent medical treatment, rescue attempts, subsequent disease or injury, and reactions to danger do not cut off proximate cause.
Unforeseeable intervening forces (independent forces): Extraordinary acts of nature and unforeseeable intentional criminal acts by third parties may be superseding, but only if the defendant’s negligence did not create the risk that made them possible.
When the fact pattern includes multiple events between the defendant’s negligence and the plaintiff’s injury, don’t panic. Trace the risk: What made the defendant’s conduct negligent? Was this type of harm within that risk? If yes, the intervening events are just details in the causal story, not a basis to let the defendant off the hook.
Proximate cause questions reward clear risk-based thinking. The MBE wants you to identify the scope of the risk created by the defendant’s negligence and determine whether the harm falls within it. Master that framework, and these questions become manageable — even when the fact patterns throw in ambulance crashes, panicked rescuers, and botched surgeries.
If you want all 88 negligence and proximate cause rules organized for efficient review, FlashTables Torts breaks down every element, exception, and distinction the MBE tests. The two-column format lets you quiz yourself on the black-letter law without wading through paragraphs of explanation. For proximate cause specifically, the structured format helps you see how foreseeability, intervening causes, and superseding causes fit together as part of the causation analysis — making it easier to apply the rules under time pressure on test day.