According to Buddhism, health is not a condition in which we merely escape negative influences. It is a highly positive, active state in which we hold ourselves responsible for such influences, in which we face and try to solve various problems–not just our own but others’ problems, too. The word disease implies a lack of ease, which conversely implies that health is a state of comfort. In the Buddhist sense, however, being “at ease” does not mean freedom from difficulties; it means having the strength to meet and overcome any problem.
from sgi.org