Collocations for sickness - noun

chronic
long, long-term (esp. BrE)
The policy includes long-term sickness cover.

feign
I tricked my father by feigning sickness.

absence (BrE)
benefit (BrE)
cover, insurance (esp. BrE)
levels, rates
Staff sickness rates are at record levels.

due to sickness, owing to sickness, through sickness
The Personnel Department keeps a record of employees absent through sickness.

suffer, suffer from

rise
The sickness rose inside him.

a feeling of sickness
Several workers complained of feelings of sickness and headaches.

acute, chronic, severe
air, car, motion, sea (usually seasickness), travel (usually travel-sickness)
altitude, mountain
decompression, radiation, sleeping
morning

cause, induce
This activity may induce motion sickness.

experience, get
prevent
cure, treat