“Affect” and “effect” trip up even experienced writers — largely because both words can technically function as either a noun or a verb, though one usage of each is far more common than the other.
The Short Answer
Affect is almost always a verb, meaning to influence something: “The weather affected our plans.” Effect is almost always a noun, meaning the result of that influence: “The weather had an effect on our plans.” If you need a verb, reach for “affect”; if you need a noun, reach for “effect.”
Examples of “Affect” (Verb)
- The news affected her deeply.
- Poor sleep can affect your concentration.
- Rising prices affect everyone’s budget.
- Does caffeine affect your sleep?
Examples of “Effect” (Noun)
- The medicine had an immediate effect.
- What effect will this policy have?
- The special effects in the movie were impressive.
- Her speech had a powerful effect on the audience.
The Rare Exceptions
“Effect” can occasionally be a verb meaning “to bring about,” as in “The new manager effected real change” — but this usage is formal and uncommon. “Affect” can also be a noun in psychology, referring to a person’s observable emotional expression, but this is a specialized, technical use most writers will never need.
A Simple Memory Trick
Remember “RAVEN”: Remember, Affect is a Verb, Effect is a Noun. If you’re describing an action, use “affect.” If you’re naming a result, use “effect.”
Frequently Asked Questions
Can “effect” ever be a verb?
A: Yes, but rarely — it means “to bring about” in formal writing, as in “effect a change,” which is different from “affect a change.”
What’s the easiest way to remember the difference?
A: Use the RAVEN trick — Affect is a Verb, Effect is a Noun — for the overwhelming majority of everyday cases.
Which one do I use for “side effects” of medication?
A: “Effect” — side effects are the noun results of taking the medication, not the act of influencing something.
