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The “Eggshell Skull” Rule

A brown eggshell cracked open at the top, revealing its empty interior against a plain background.

Did a new injury make an old conditioworse or act up again? Massachusetts law has your back, so to speak. An injured person has the right to be compensated for a new injury, which aggravates a pre-existing condition.

Since 1935, the law in Massachusetts has been clear that an injured person has the right to be compensated by a negligent third party for the aggravation of pre-existing condition. This is the case regardless of how bad the condition was in the past or was at the time of the recent incident. All that is required is that the condition is made worse. Moreover, the law applies the same to police officers and firefighters who are injured on duty as it would to any other employee injured at work.

An example often used in law school to explain this rule is when a negligent third party cuts a person who is a hemophiliac and that person subsequently bleeds to death from the cut, the third party is responsible for that person’s death, even if another person without this rare condition would not have died from the cut. Essentially, the responsible party must compensate an injured person regardless of how susceptible the person may be to injury. Fittingly, this is what is known as the “eggshell skull” rule.

Over the years, we have successfully brought claims despite the fact that our client’s injury was to a part of the body which had been injured or operated on in the past. As long as the injury is made worse than it was before, the negligent party is responsible for aggravating the condition.

For more information about your right to make a claim involving a pre-existing condition, please feel free to email or call me with any questions.

By Attorney Jared Ballin

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We have specialized in personal injury law for the last 40 years, and we’re still going strong. Because personal injury is our sole focus, you can rest assured you are getting the most targeted, skilled and experienced legal services possible. We have successfully represented clients from every corner of Massachusetts, from Pittsfield to Provincetown.


The work we do for our clients not only provides justice for their harms and losses, but it also makes our communities safer for everyone. When you’ve been injured in an accident, you need the best in legal representation. We know our way through the system, and our experience and expertise give us an advantage over other lawyers. Get in touch today for your free consultation.

Massachusetts Personal Injury Attorney

Representing Clients Throughout The Commonwealth of Massachusetts
For 35 years, Ballin & Associates has represented clients who have been injured throughout the Commonwealth of Massachusetts. A sampling of these communities includes, but is not limited to, Andover, Arlington, Attleboro, Auburn, Beverly, Billerica, Boston, Braintree, Brockton, Brookline, Cambridge, Canton, Chelmsford, Chelsea, Dartmouth, Dedham, Easton, Everett, Fall River, Falmouth, Fitchburg, Foxborough, Framingham, Franklin, Gloucester, Haverhill, Holyoke, Lawrence, Leominster, Lexington, Lowell, Lynn, Malden, Mansfield, Marlborough, Medford, Methuen, Middleborough. Millbury, Natick, New Bedford, Needham, Newton, Norwood, Peabody, Pittsfield, Plymouth, Quincy, Randolph, Revere, Salem, Seekonk, Sharon, Shrewsbury, Somerville, Springfield, Stoughton, Swansea, Taunton, Walpole, Waltham, Watertown, Wellesley, West Springfield, Westwood, Weymouth, Woburn, and Worcester. Please see the complete list of communities where we have represented clients on injury matters in the past.

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