It's a controversial diagnosis where the symptoms are claimed to be caused by mental processes rather then by actual physiological causes. The concept is a "mind over matter" type one, in that one can subconsciously cause physical symptoms to occur. Essentially what it means is that "we can't determine a cause for your illness, so it must be caused by your head". Not to say that it's not real, we understand that it is real for the sufferer.
psychophysiological illnesses
Psychophysiological insomnia is excessive worrying about whether or not a person will be able to fall asleep, which creates so much anxiety that the person's bedtime rituals and behavior trigger insomnia.
A psychophysiological disorder is a physical illness or condition that is influenced by psychological factors such as stress, anxiety, or emotional trauma. These disorders involve a complex interaction between the mind and body, with symptoms that can be triggered or worsened by psychological distress. Treatment often involves addressing both the physical and psychological aspects of the disorder.
It appears that all diseases have psychological components
psychophysiological - conditions/ stress responses that have both mind and body components
Biofeedback, or applied psychophysiological feedback
Peter Henry Venables has written: 'A manual of psychophysiological methods'
Physiological mechanisms underlying a trade-off between growth rate and tolerance of feed deprivation in the European sea bass
Most states do not accept psychophysiological veracity (PV) examination (polygraph) results in a civil court cases
psychosomatic illnesses
did the celts have any illnesses
What are coomon illnesses in Egypt?