Yes. I would like to add that in some conditions it varies, as Tammy mentioned, depending on the individual and where they're at in the continuum of their illness. Some illnesses become worse over time, and other illnesses stay fairly steady, with episodes of illness and wellness. Some episodes are worse than others but do not necessarily get worse over time. You may be able to work your whole life with these episodes of disability. If you've been living with an illness for 30 years, it doesn't necessarily mean you're going to be worse at the end of it. For example, some people with episodes of certain kinds of mental illnesses do not necessarily get worse over time. Some people with multiple sclerosis have episodes; some get worse over time, and some don't. It varies from person to person. It's the flexibility that's the most important thing.
On April 18th, 2013. See this statement in context.