In the legal profession and courts, a querulant (from the Latin querulus - "complaining") is a person who obsessively feels wronged, particularly about minor causes of action.
In particular the term is used for those who repeatedly petition authorities or pursue legal actions based on manifestly unfounded grounds.
According to Mullen and Lester, the life of the querulant individual becomes consumed by their personal pursuit of justice in relation to minor grievances.
The concept had, until 2004, disappeared from the psychiatric literature; largely because it had been misused to stigmatise the behavior of people seeking the resolution of valid grievances.
[5] According to Lester et al. querulous behavior remains common, as shown in petitions to the courts and complaints organizations.