The 1984 United Nations Convention Against Torture (Article 1) provides a definition of torture that is considered customary.
International humanitarian law (IHL) differs somewhat from this definition in not requiring the involvement of a person acting in an official capacity as a condition for an act intended to inflict severe pain or suffering to be defined as torture.
The ICRC uses the broad term " ill-treatment " to cover both torture and other methods of abuse prohibited by international law, including inhuman, cruel, humiliating, and degrading treatment, outrages upon personal dignity and physical or moral coercion.
The legal difference between torture and other forms of ill treatment lies in the level of severity of pain or suffering imposed. In addition, torture requires the existence of a specific purpose behind the act – to obtain information, for example.
The various terms used to refer to different forms of ill treatment or infliction of pain can be explained as follows:
Torture: existence of a specific purpose plus intentional infliction of severe suffering or pain;
Cruel or inhuman treatment: no specific purpose, significant level of suffering or pain inflicted;
Outrages upon personal dignity: no specific purpose, significant level of humiliation or degradation.
Methods of ill treatment may be both physical and/or psychological in nature and both methods may have physical and psychological effects.