a pain
Examples
Sometimes it is harder to deprive oneself of a pain than of a pleasure.
Before we make love, my husband takes a pain killer.
Sometimes it is harder to deprive oneself of a pain than of a pleasure and the memory so possessed him that for the moment there was nothing to do but to pretend.
A pain in the foot is soon forgotten -- a pain in the head is not.
Jealousy is a pain which eagerly seeks what causes pain.
He who looks up too much gets a pain in the neck.