How Pre-Existing Conditions Affect Illinois Workers’ Compensation Cases

 Posted on September 03, 2025 in Workers' Compensation

Pre-existing medical issues are common in workers’ compensation claims, but they do not automatically prevent an employee from receiving benefits. Illinois law focuses on whether a workplace accident or occupational exposure created a condition or aggravated or accelerated an existing problem. When that happens, the injury is generally covered, even if the worker had symptoms or treatment in the past. A Kane County, IL workers’ compensation attorney can help explain how these rules apply and what evidence is needed to prove the connection between the job and the worsening of your condition.

Common Pre-Existing Conditions That Could Get Worse in the Workplace

Some injuries and illnesses make workers more vulnerable to harm on the job. For example, someone with a prior back injury may be at higher risk for complications when lifting heavy boxes. A worker with arthritis may find repetitive motion tasks more difficult. Other common conditions that often worsen at work include:

• Previous fractures or bone injuries that may weaken certain areas of the body

• Degenerative disc disease, which can flare up with heavy lifting or bending

• Respiratory problems, such as asthma, made worse by dust or chemicals

• Carpal tunnel syndrome that can become exacerbated by working at a desk and on a computer

• Heart disease or high blood pressure, which can be triggered by stressful or physically demanding work

Illinois law protects workers even if they have medical histories. Under 820 ILCS 305/1, the Illinois Workers’ Compensation Act requires coverage for injuries that arise out of and in the course of employment, even if an earlier condition contributed to the harm.

How Do Pre-Existing Conditions Complicate Workers’ Compensation Claims?

Insurance companies often argue that an employee’s medical problems are unrelated to their work injury, hoping to reduce or deny benefits. They may point to medical records showing a history of pain or treatment before the work accident. However, Illinois law clearly states that if your job aggravated the condition, you can still qualify for compensation.

For example, under 820 ILCS 305/8, an injured worker may be entitled to medical treatment, temporary disability payments, or permanent partial disability benefits. Even if your back was injured years ago, if a new workplace accident causes further damage, you may still receive coverage.

Nevertheless, these claims can be challenging. Doctors may be asked to separate the effects of the work injury from the pre-existing condition. Independent medical exams (IMEs) are often ordered to give the insurance company more evidence. An experienced attorney can help gather supportive medical opinions and argue that your work injury materially worsened your health.

What Do I Do if My Claim Is Denied Because of a Pre-Existing Condition?

Denials are common in cases involving pre-existing injuries. If you receive a notice that your claim has been rejected, you still have legal options. To start, you can appeal to the Illinois Workers’ Compensation Commission (IWCC). Under 820 ILCS 305/19, the IWCC has the authority to hear disputes between injured workers and insurance companies.

The appeals process often requires new medical records and statements from your doctor. It may also involve questioning the insurance company’s experts. Many cases are resolved at arbitration, but if needed, your case can proceed through multiple levels of review. Having an attorney by your side is especially important when medical history plays a major role in the claim.

Schedule a Free Consultation With an Aurora, IL Workers’ Compensation Attorney

The right legal guidance can make all the difference in a complex workers’ comp case. At Kinnally Flaherty Krentz Loran Hodge & Masur P.C., many of our attorneys have been recognized as Leading Lawyers or Super Lawyers, an honor reserved for the top five percent of Illinois attorneys. This recognition reflects the level of commitment and knowledge we bring to every case. Call 630-907-0909 to schedule a free consultation with experienced Kane County, IL workers’ compensation lawyers today and take the first step toward protecting your rights after a workplace injury.