AFFLICT is a general term and applies to the causing of pain or suffering or of acute annoyance, embarrassment, or any distress. ills that afflict the elderly
TRY suggests imposing something that strains the powers of endurance or of self-control. children often try their parents' patience
TORMENT suggests persecution or the repeated inflicting of suffering or annoyance. a horse tormented by flies
TORTURE adds the implication of causing unbearable pain or suffering. tortured by a sense of guilt
RACK stresses straining or wrenching. a body racked by pain