Critical illness rider can be used under critical health conditions like stroke, paralysis, cancer, etc.. (life.indiainsured.com)
The Critical Illness rider also allows the insured to use the death benefit of their policy in the case of critical health conditions such as cancer, heart attack, stroke, a major organ transplant, end - stage renal failure, ALS, blindness or paralysis of two or more limbs. (wealthmanagement.com)
Intensive Care Units in clinics and hospitals deal with critical health conditions. (template.net)