Psychological torture is less well known than physical torture and tends to be subtle and much easier to conceal. In practice, the distinctions between physical and psychological torture are often blurred. Physical torture is the inflicting of severe pain or suffering on a person. In contrast, psychological torture is directed at the psyche with calculated violations of psychological needs, along with deep damage to psychological structures and the breakage of beliefs underpinning normal sanity. Torturers often inflict both types of torture in combination to compound the associated effects.