(n): (medicine) any sensation or change in bodily function that is experienced by a patient and is associated with a particular disease
(n): emotional distress; a fundamental feeling that people try to avoid
(n): the experiencing of affective and emotional states
(n): a somatic sensation of acute discomfort
(n): the perception of tactual or proprioceptive or gut sensations
(n): a bothersome annoying person
(n): a person who is not pleasant or agreeable
(n): something or someone that causes trouble; a source of unhappiness
(n): a stimulus with undesirable consequences
(v): cause bodily suffering to and make sick or indisposed
(v): give trouble or pain to
(v): cause emotional anguish or make miserable
(v): cause to lose one's composure
Pain with a capital P:
In Primal Theory, "Primal Pain is deprivation or injury which threatens the developing child. A parent's warning is not necessarily a Primal Pain for the child. Utter humiliation is...An infant left to cry it out in the crib is in Pain...It is not hurt as such which defines Primal Pain but rather the context of the hurt or its meaning to the impressionable developing consciousness of the child."
Arthur Janov described Pain as the pain that doesn't hurt because, as soon as they go into it, it becomes simply feeling. Most of the suffering component is in the blockage or repression.
_Wikipedia
Bread (French).
"Life is pain, Highness! Anyone who says differently is selling something."
(Westley, The Princess Bride)
"It's a lie, a kiss with open eyes
And she's not breathing back
Anything but bother me
It takes my pain away
Never mind, these are hurried times
I can't let it bother me"