Self-explanatory.

Pronunciation: /peɪn/
noun
[mass noun]

1highly unpleasant physical sensation caused by illness or injury: she’s in great pain [count noun]: chest pains
(also pain in the neck or vulgar slang arse) informal an annoying or tedious person or thing: she’s a pain

2mental suffering or distress: the pain of loss

3 (pains) great care or trouble: she took pains to see that everyone ate well

verb
[with object]

cause mental or physical pain to: it pains me to say this her legs had been paining her