Definition of "Pain" :

noun: a somatic sensation of acute discomfort

"As the intensity increased the sensation changed from tickle to pain."

noun: something or someone that causes trouble; a source of unhappiness

noun: emotional distress; a fundamental feeling that people try to avoid

"The pain of loneliness."

noun: a bothersome annoying person

"That kid is a terrible pain."

noun: a symptom of some physical hurt or disorder

"The patient developed severe pain and distension."

verb: cause bodily suffering to and make sick or indisposed

verb: cause emotional anguish or make miserable

"It pains me to see my children not being taught well in school."