agonizing, bad, painful, severe
sudden
She had a sudden painful cramp in her left leg.

leg, muscle
abdominal cramps, menstrual cramps, stomach cramps

attack (BrE)
I was suddenly seized by an attack of cramp.

get, have, suffer
ease, relieve
prevent

cramp in
I was beginning to get cramp in my leg. (BrE)
I was beginning to get a cramp in my leg. (AmE)

Cramp is used with these nouns as the subject:
muscle