To make an unnecessary fuss, moan, bother.
To pester or irritate someone.
mother
To repeatedly remind or complain to (someone) in an annoying way, often about insignificant or unnecessary matters.
To bother with persistent thoughts or memories.
Anyone would think that I nagged at you, Amanda! (From Amanda! by Robin Klein)
a nagging pain in his left knee
The notion that he forgot something nagged him the rest of the day.
To bother or disturb persistently in any way.
Someone or something that nags.
A persistent, bothersome thought or worry.
An old, useless horse.
A repeated complaint or reminder.
A small horse; a pony.