Pre-Existing Conditions and the Eggshell Plaintiff Rule

A pre-existing condition generally does not prevent an injured person from recovering compensation when another party’s negligence aggravates or worsens it. Under the eggshell plaintiff rule, also called the thin-skull rule, the defendant may be responsible for the full extent of the harm caused, even if the victim was vulnerable. The key distinction is between the condition that existed before the incident and the additional injury or aggravation resulting from it.

If you or a loved one has a personal injury case and questions about recovering compensation when a pre-existing condition is involved, reach out to an experienced personal injury attorney in your area. They can explain your legal options and evaluate your claim.

Pre-Existing Conditions: Why Some Injury Victims Believe They May Not Have a Claim

Some insurance companies point to medical history to minimize or deny claims. Victims may feel guilty or responsible for being “already injured.” Secondhand stories can also confuse what a pre-existing condition means for a personal injury claim.

However, the law does not require accident victims to be in perfect condition before the incident to receive full compensation. A significant share of adults live with some chronic condition, such as arthritis, prior surgeries, or degenerative disc disease.

If prior conditions bar recovery, most injured people would be unable to pursue their claims. A specific legal theory addresses individuals with prior conditions who were injured due to another’s negligence.

The Eggshell Plaintiff Doctrine

According to the eggshell plaintiff rule (also known as the “eggshell skull rule” or the “thin skull rule”), a defendant is liable for the full extent of the harm caused, even if the victim was more vulnerable than an average person.

The analogy goes like this: if someone has a skull as fragile as an eggshell, the at-fault party cannot argue that a “normal” person would have suffered less. This applies even if the plaintiff’s pre-existing condition or susceptibility made the injuries worse than a typical person would suffer.

What the Eggshell Plaintiff Rule Means

The defendant takes the plaintiff as he finds them. This applies even if the defendant didn’t know or couldn’t know about the plaintiff’s condition, as long as the defendant’s actions proximately caused the injury. This rule can apply even if the defendant couldn’t foresee the full extent of the harm.

Where the Eggshell Plaintiff Rule Comes From

The eggshell plaintiff rule originates from a 19th-century case out of Wisconsin in which a minor kick to a schoolmate’s leg caused severe complications due to a prior injury. Every state follows this rule in one form or another.

Why the Eggshell Plaintiff Rule Exists

Tort law is deeply shaped by public policy goals. The policy supporting the eggshell plaintiff rule is fairness and accountability.

• Fairness. The person who caused the harm, not the injured person, should bear the consequences of the injury-causing act.
• Accountability. Defendants should not be able to escape liability simply because a victim was susceptible to injury due to a condition before the accident.

The Key Legal Distinctions in the Eggshell Plaintiff Rule

Although you generally cannot be compensated for the pre-existing condition itself, you can be compensated if someone else’s negligence or intentional act aggravated your injuries.

Damages You Cannot Recover

An injured person generally cannot seek damages for medical expenses and treatment for a pre-existing injury as it existed before the incident. For example, if someone already needed treatment for chronic knee pain, the defendant isn’t responsible for the physical therapy and other medical care for the baseline condition.

Damages You Can Recover

You can recover compensation for the aggravation, acceleration, or worsening of the condition caused by the defendant’s negligence. Recoverable damages may include:

• Additional medical treatment, surgery, or physical therapy
• Increased pain and suffering
• Lost wages or reduced earning capacity due to the worsening of condition
• Diminished quality of life

Recovery is typically available if the plaintiff can show that the incident worsened the condition and increased the pain and suffering compared with before the incident.

The Role of Causation and Apportionment in Personal Injury Cases

The injured party must prove that the incident caused the pre-existing condition to worsen. This is typically proved through medical evidence and expert testimony.

A plaintiff will usually present expert testimony and medical records to show the injured person’s medical “baseline”, that is, their health before the incident compared with after.

A defendant might contend that the injured person’s condition would have deteriorated anyway–even without the accident. If the factfinder (the judge or the jury) agrees, then they may limit damages to the portion attributable to the incident. Many jurisdictions have jury instructions that specifically address the aggravation of pre-existing conditions.

Practical Implications of the Eggshell Plaintiff Rule

The eggshell plaintiff rule can arise in many common personal injury scenarios. Consider the following examples.

• Car accidents. A driver with mild degenerative arthritis in the neck develops severe, ongoing pain after a rear-end collision.
• Slip and fall actions. A shopper with an existing shoulder injury re-tears the repaired tissue after slipping and falling on an unmarked wet floor.
• Workplace injury. An individual with controlled diabetes experiences complications from a wound that fails to heal after a workplace injury.

If you experience an injury and have a personal injury case, be honest about your medical history because attempting to conceal the injury can damage your credibility and jeopardize the claim. Gather all relevant medical records. You will need these to establish a baseline and show how the injury affected your condition.

Getting medical care and following your treatment plan creates a clear record linking the incident to the worsening of your condition and gives insurance adjusters less to dispute about causation.

Avoid giving recorded statements or signing a broad medical authorization before consulting a personal injury attorney. When making your case, you or your attorney will typically rely on medical experts to explain how the incident aggravated the condition.

Talk to a Personal Injury Lawyer If Your Injury Got Worse After the Accident

A pre-existing condition does not necessarily disqualify you from recovering compensation from the party that caused you harm. You would need to show that the incident caused harm beyond what you had before. Proving causation can often involve complex medical and legal questions. As such, legal representation is critical.

An experienced personal injury attorney in your area can consider the specific facts of your case, work with medical experts, and pursue fair compensation on your behalf. Because laws governing how the eggshell plaintiff rule applies to pre-existing conditions vary by state, it is wise to have a local attorney review your case.