valetudinarianism

noun

1. a person in poor health; invalid
2. one who thinks constantly and anxiously about one's own health

Origin: < L valetudinarius, sickly, infirm, an invalid < valetudo (gen. valetudinis), state of health, sickness < valere, to be strong: see value

adjective

1. characterized by or in poor health; sickly
2. anxiously concerned about one's health