Psychological pain is an unpleasant feeling (a suffering) of a psychological, non-physical, origin. A pioneer in the field of suicidology, Edwin S. Shneidman, described it as "how much you hurt as a human being. It is mental suffering; mental torment." There is no shortage in the many ways psychological pain is referred to, and using a different word usually reflects an emphasis on a particular aspect of mind life. Technical terms include algopsychalia and psychalgia,  but it may also be called mental pain, emotional pain, psychic pain, social pain, spiritual or soul pain, or suffering. While these clearly are not equivalent terms, one systematic comparison of theories and models of psychological pain, psychic pain, emotional pain, and suffering concluded that each describe the same profoundly unpleasant feeling. Psychological pain is believed to be an inescapable aspect of human existence.
Other descriptions of psychological pain are "a wide range of subjective experiences characterized as an awareness of negative changes in the self and in its functions accompanied by negative feelings", "a diffuse subjective experience ... differentiated from physical pain which is often localized and associated with noxious physical stimuli", and "a lasting, unsustainable, and unpleasant feeling resulting from negative appraisal of an inability or deficiency of the self."
The adjective ‘psychological’ is thought to encompass the functions of beliefs, thoughts, feelings, and behaviors, which may be seen as an indication for the many sources of psychological pain. One way of grouping these different sources of pain was offered by Shneidman, who stated that psychological pain is caused by frustrated psychological needs. For example, the need for love, autonomy, affiliation, and achievement, or the need to avoid harm, shame, and embarrassment. Psychological needs were originally described by Henry Murray in 1938 as needs that motivate human behavior. Shneidman maintained that people rate the importance of each need differently, which explains why people's level of psychological pain differs when confronted with the same frustrated need. This needs perspective coincides with Patrick David Wall’s description of physical pain that says that physical pain indicates a need state much more than a sensory experience.
In the fields of social psychology and personality psychology, the term social pain is used to denote psychological pain caused by harm or threat to social connection; bereavement, embarrassment, shame and hurt feelings are subtypes of social pain. Just like physical pain, social pain is thought to serve a function of adaptation and avoidance from what caused the pain. From an evolutionary perspective, psychological pain forces the assessment of actual or potential social problems that might reduce the individual’s fitness for survival. The way we display our psychological pain socially (for example, crying, shouting, moaning) serves the purpose of indicating that we are in need.
Emotional agony in borderline personality disorder
Borderline personality disorder has long been believed to be the one psychiatric disorder that produced the most intense emotional pain, agony, and distress in those who suffer with this condition. Studies have shown that borderline patients experience chronic and significant emotional suffering and mental agony. Borderline patients may feel overwhelmed by negative emotions, experiencing intense grief instead of sadness, shame and humiliation instead of mild embarrassment, rage instead of annoyance and panic instead of nervousness. People with BPD are especially sensitive to feelings of rejection, isolation and perceived failure. Both clinicians and laymen alike have witnessed the desperate attempts to escape these subjective inner experiences of these patients. Borderline patients are severely impulsive and their attempts to alleviate the agony is often very destructive or self-destructive. Suicidal ideation, suicide attempts, eating disorders (anorexia nervosa and bulimia nervosa), self-harm (cutting, overdosing, etc), compulsive spending, gambling, sex addiction, violent and aggressive behaviour, sexual promiscuity and deviant sexual behaviours, or desperate attempts to escape through hard drugs. The intrapsychic pain experienced by those diagnosed with BPD has been studied and compared to normal healthy controls and to others suffering from major depression, bipolar disorder, substance use disorder, schizophrenia, other personality disorders, and a range of other conditions. The excruciatingly painful inner experience of the borderline patient is both unique and perplexing. In clinical populations, the rate of suicide of patients with borderline personality disorder is estimated to be 10%, a rate far greater than that in the general population and still considerably greater than for patients with schizophrenia and bipolar disorder. However, since 60%–70% of patients with borderline personality disorder make suicide attempts, unsuccessful suicide attempts are far more frequent than completed suicides in patients with borderline personality disorder.
The intense dysphoric states which patients diagnosed with borderline personality disorder (BPD) endure on a regular basis distinguishes them from those suffering from other personality disorders, major depressive disorder, bipolar disorder, and virtually all known Axis I and Axis II conditions. In a study, twenty-five dysphoric states (mostly affects) were found to be significantly more common among borderline patients than controls. Twenty-five other dysphoric states (mostly cognitions) were found to be both significantly more common among borderline patients than controls and highly specific to borderline personality disorder. These states tended to fall into one of four clusters: (1) extreme feelings, (2) destructiveness or self-destructiveness, (3) fragmentation or “identitylessness,” and (4) victimization. In addition, three of the 25 more-specific states (feeling betrayed, like hurting myself, and completely out of control), when occurring together, were particularly strongly associated with the borderline diagnosis. Equally important, overall mean Dysphoric Affect Scale scores correctly distinguished borderline personality disorder from other personality disorders and mood disorders such as bipolar disorder, major depression, and anxiety disorders in 84% of the subjects. Taken together, the results of this study suggest that the subjective pain of borderline patients may be both more pervasive and more multifaceted than previously recognized, and that the overall “amplitude” (or intensity) of this pain may be a particularly good marker for the borderline diagnosis.
Research suggests that physical pain and psychological pain may share some underlying neurological mechanisms. Brain regions that were consistently found to be implicated in both types of pain are the anterior cingulate cortex and prefrontal cortex (some subregions more than others), and may extend to other regions as well. Brain regions that were also found to be involved in psychological pain include the insular cortex, posterior cingulate cortex, thalamus, parahippocampal gyrus, basal ganglia, and cerebellum. Some advocate that, because similar brain regions are involved in both physical pain and psychological pain, we should see pain as a continuum that ranges from purely physical to purely psychological. Moreover, many sources mention the fact that we use metaphors of physical pain to refer to psychological pain experiences.
Research has shown that use of analgesic paracetamol for several weeks reduces neural response to meaning threats, such as thinking about death, and reduces the agitation of people with dementia. However use of paracetamol for more general psychological pain remains disputed.
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