Preexisting Conditions and Workers’ Compensation in Illinois: What Injured Workers Need to Know

Wayne Rollag | May 19 2026 16:00

Many workers hesitate to file a workers’ compensation claim if they already have a preexisting injury, fearing it will automatically disqualify them. The good news is this: under Illinois law, you can still recover benefits even if you had a prior medical condition — as long as your work accident aggravated, accelerated, or worsened that condition. As experienced workers compensation attorneys in Chicago, we help injured employees understand and protect their rights every day.

Preexisting Conditions Do NOT Bar Your Claim

Workers’ compensation covers injuries that arise out of and in the course of employment. If your job duties or a workplace accident made an existing condition worse, you may still be entitled to medical treatment, wage benefits, and other compensation. Our Illinois workers compensation lawyers routinely secure benefits for workers with long‑standing medical issues.

Common Preexisting Conditions Involved in Claims

It’s extremely common for employees to have health issues long before a work‑related injury occurs. Some of the most frequent conditions we see include:

  • Back and neck problems
  • Arthritis
  • Previous fractures or surgeries
  • Joint damage in shoulders, knees, or hips
  • Chronic pain or degenerative conditions

If your job duties — such as lifting, repetitive motion, bending, or a sudden on‑the‑job accident — worsen these conditions, your claim may still be fully valid. A knowledgeable Chicago workplace injury lawyer can help prove that connection.

The Key Issue Is Aggravation

Illinois law focuses on one core question: did your work aggravate, accelerate, or worsen your preexisting condition? Even if your injury would not have occurred without the underlying condition, you can still recover benefits if your job contributed to the worsening. This is a point our Chicago workers comp attorneys regularly argue on behalf of clients.

Documentation Is Critical

Your medical records will play a major role in proving your condition became worse because of your work. Be sure to:

  • Tell your doctor exactly how the work injury affected you
  • Explain how your symptoms have changed or intensified
  • Follow all recommended treatment plans

Your doctor’s notes, diagnostic tests, and treatment history help establish the link between your job duties and your aggravated condition — evidence your injury claim lawyer in Chicago will rely on.

Why Insurance Companies Push Back

Workers’ compensation insurers often try to blame everything on a preexisting condition to reduce or deny benefits. Having an experienced Illinois workers compensation lawyer on your side can help counter these arguments and ensure your rights are protected throughout the claims process.

If you have a preexisting injury and believe your job made it worse, our team at Bailey & Rollag Law Firm is here to help you understand your rights and pursue the benefits you deserve. Visit baileyrollaglaw.com to learn more or speak with a trusted Chicago workers compensation attorney.