The Clinical Frailty Scale (CFS) was introduced in the second clinical examination of the Canadian Study of Health and Aging (CSHA) as a way to summarize the overall level of fitness or frailty of an ...

It's a new state of fatigue that has lasted for at least 6 months. CFS is more than feeling tired all the time. It comes with a lot of other symptoms that can make it hard to handle daily life.