The eggshell plaintiff rule means a defendant may be responsible for the full extent of harm even when the plaintiff was unusually vulnerable.
The rule is often summarized as taking the plaintiff as found. If a wrongful act causes injury, the defendant generally cannot escape responsibility simply because a healthier or less vulnerable person would have suffered less harm.
Why the eggshell plaintiff rule matters
Injury severity can depend on preexisting conditions, age, medical vulnerability, psychological susceptibility, or other individual traits. The eggshell plaintiff rule affects damages by focusing on the actual harm caused to the actual plaintiff.
The rule does not eliminate causation. The plaintiff still must connect the defendant’s conduct to the injury and separate caused harm from unrelated conditions where required.
Where it appears
The eggshell plaintiff rule appears in personal-injury cases, negligence actions, battery claims, emotional-distress cases, medical vulnerability disputes, and damages arguments after accidents or intentional torts.
How it differs from nearby terms
The eggshell plaintiff rule is different from proximate cause. Proximate cause limits responsibility for remote harms; the eggshell rule addresses the extent of injury once legally caused harm is established.
It is also different from damages generally. Damages are the remedy measure; the eggshell rule helps determine how a plaintiff’s unusual vulnerability affects that measure.
Practical example
A negligent collision causes a minor impact, but the plaintiff has a medical condition that makes the injury far more severe than expected. The defendant may still be responsible for the full injury if the collision legally caused it.
Related terms
Quick check
The rule affects how vulnerability is treated after causation is shown. It does not prove causation by itself.