Yes, taking too many sick days can be grounds for termination. Taking a sick day without employer approval may result in valid termination in some states.This is also true for taking too many sick days. Wrongfully terminated? If you believe you have been wrongfully terminated because of discrimination or retaliation, you can file a claim. If you were fired for exercising your legal rights or complaining of illegal activity, you may have a case against your employer. Under Illinois law, your employer may not be able to fire you because you are sick or taking care of a sick family member. For example, you may have been illegally terminated from your job because you are 50 years of age. This would be considered unlawful discrimination and the. Federal law entitles you to a safe workplace.