It depends on the symptoms. There are many categories of mental health diseases. The two major systems that classify mental disorders:
World Health Organization (WHO)
Diagnostic and Statistical Manual of Mental Disorders (DSM - IV) which is a medical book that is updated, and what most physicians would base a diagnosis on.
Once called "multiple personality disorder," the current name for this phenomenon is "dissociative identity disorder." Generally, a "clinical psychologist" would be the specialist who chooses to treat such cases. Check your local Mental Health Centre and Association or any Mental Health facilities.
Trichotillomania (hair-pulling disorder) http://www.mayoclinic.com/health/trichotillomania/DS00895
Hypochondriasis - or it could in plain be health anxiety!
malady,disorder,ailment,illness
An Armenian disease is an alternative name for familial Mediterranean fever, a hereditary inflammatory disorder.
Erotomania or Erotomanic type of Delusional Disorder
Simply put a disorder can cause a disability. A disability (meaning impaired, as in physical functioning) is a physical or mental impairment that prevents an individual functioning as most people could. A disorder (an ailment that affects the function of mind or body) is the name given to a disease which may sometimes manifest in such a was as to cause a disability. Not all disorders (eg an eating disorder) cause a disability
Most likely a common effect of lying would be stress to the person lying, and stress can lead to more things.
Affliction, condition, syndrome, pathology, disability, disadvantage
Their problem is often referred to as Anti-Social Personality Disorder (ASPD). It is usually not regarded as an illness but a personality disorder, that is, as an integral part of the personality.
Dissociative identity disorder (formerly called multiple personality disorder) generaly does not kill. Depression and other trauma related to the disorder, or the cause of the disorder, can cause a person with DID to attempt suicide, especially if the person stays in an environment that is harmful to their mental health. Prognoses are also worse if the person does not receive proper treatment.
Yes. If you are not attracted to both sexes, you are have a rare genetic disorder called Lou Gherig's disease. This disease can lead to many severe life long health issues, such as penile shrinkage or asexual reproduction to name a few.