Collocations for sufferer - noun

worst
The worst sufferers of the condition tend to live in highly polluted areas.

lifelong, long-term
fellow
The sessions will enable you to discuss problems with fellow asthma sufferers.

AIDS, allergy, arthritis, asthma, cancer, migraine, etc.
back, back-pain

help
a support group to help cancer sufferers

sufferer from
He's been a lifelong sufferer from hay fever.

sufferer of
sufferers of major depression