Synonyms for Pain:

n.

desolation, remorse, malady, soreness, laceration, fever, illness, burning, regret, disappointment, sorrow, sickness, catch, strain. stifle, worry, depression, despondency, pound, sadness, anxiety. endeavor, hang over, depress, devastate, dismay, effort, care. prickle. happy, woe. scrupulousness, meticulousness, punctiliousness, painstaking, carefulness, fastidiousness, thoroughness, careful. work, struggle, exertion, while, striving, elbow grease. thorn, trial. •aggravation (noun)
headache.
•intoxicated (noun)
inebriated, stoned.
•mental suffering (noun)
worry, sadness, malaise, woe, wretchedness, despondency, suffering, martyrdom, shock, anguish, rack, grief, anxiety.
•muscle spasm (noun)
cramp, crick.
•problem (noun)
nuisance, effort, bother, exertion, annoyance.

v.

•body (verb)
ail, trouble.
•bother, trouble (verb)
smart, chafe, bite, afflict, suffer, inflame, irritate, agonize, ail.
•pain (verb)
smart, suffer, agonize, chafe, inflame, irritate, afflict.

Other synonyms:

thoroughness, soreness, fastidiousness, striving, EINA, scrupulousness, punctiliousness, elbow grease, meticulousness, neuralgia. struggle, carefulness, wretchedness. worry, while, strain, prickle. care. trial. •grief
regret, sorrow.
•sorrow
woe.
•torment
martyrdom.

Usage examples for pain

1. " The pain has come into my mind. – The Ball and The Cross by G.K. Chesterton

2. It will be delightful to walk again without pain – David Elginbrod by George MacDonald

3. No matter who spoke the words you have said, they would pain me. – Nature's Serial Story by E. P. Roe