The ER may tell you, "this crash aggravated a pre-existing condition." The insurance company will take those same words and try to turn them into: "you were already hurt, so we owe little or nothing."

That is what they want you to believe.

In reality, Illinois does not let an insurer off the hook just because your back was already bad. If a crash on I-55, I-57, or in a Chicago roadwork lane shift made an old condition significantly worse, you can still pursue payment for the new harm, the flare-up, added treatment, missed work, and future care tied to the aggravation.

What they will do next is predictable. They will ask for broad medical records, dig through years of treatment, and say your MRI changes are "degenerative." They may also argue you were partly to blame because of construction barrels, flaggers, sudden merges, or summer thunderstorm conditions.

Illinois uses modified comparative fault. You can still recover damages as long as you were less than 50% at fault. If you were, say, 20% at fault, your recovery is reduced by that amount, not wiped out.

What to do now:

• Tell every doctor exactly how your symptoms changed after the crash: stronger pain, new numbness, new limits, missed shifts.
• Make sure the chart says aggravation of pre-existing condition if that is what happened.
• Do not let the insurer record a casual statement before you know your diagnosis.
• Keep proof of lost work, prescriptions, PT, injections, and imaging comparisons.
• Get the crash report from the Chicago Police Department or Illinois State Police, depending on where it happened.

For most Illinois injury claims, the lawsuit deadline is usually 2 years from the crash. If a city agency is involved, evidence can disappear fast, so waiting hurts.