Often, someone will be injured at work and it will aggravate a condition that had been in existence before the work accident. Such as a bad back, arthritic knees, or fibromylgia. In Illinois, you can still recover Workers’ Compensation benefits for such an injury.
In Illinois, the rule is that you must have been injured in the course of your employment, or you must have aggravated a previous condition. The aggravation must be considered permanent in order to recover compensation. Some other states have a stricter requirement, however, if you have jurisdiction in Illinois you can use the more liberal rule.