Real Dictionary

suffer
verb: If you suffer from an illness or from some other bad condition, you are badly affected by it.
verb: If you suffer pain, you feel it in your body or in your mind.
verb: If you suffer something bad, you are in a situation in which something painful, harmful, or very unpleasant happens to you.
verb: If you suffer, you are badly affected by an event or situation.

suffer in American English
to undergo (something painful or unpleasant, as injury, grief, a loss, etc.); be afflicted with
intransitive verb: to undergo or feel pain or distress
transitive verb: to undergo, be subjected to, or endure (pain, distress, injury, loss, or anything unpleasant)

suffer in British English
verb: to undergo or be subjected to (pain, punishment, etc)