<unk>  disorder, now more commonly referred to as psychophysiologic<unk> , is an<unk>  whose symptoms are caused by mental processes of the sufferer rather than immediate physiological causes.  If a medical examination can find no physical or organic cause, or if an<unk>  appears to result from emotional conditions such as anger, anxiety, depression or guilt, then it might be classified as<unk> .
Psychosomatic illness
Anxiety and Stress
Sleep debt
Drug addiction
Psychopathology
Depression 
Pain disorder
Insomnia etiology