This nurse may have a Somatoform disorder which might explain why she is frequently feeling ill. People who have this disorder are not aware that this is psychological. I've included some imformation that you may find interesting.
I can understand how anxious this would make you feel as a co-worker and a friend. Even if it turns out that this is a conscious drug or attention seeking behavior, this person still needs some professional help right now. Perhaps you can arrange to meet with her privately and express your concerned for her well being and your friendship. For whatever reason, this person is calling out for help and she may feel safest asking for it from the people she sees caring for others everyday. I wish you the best, it's a tough position to be in.
Hugs to you Both,
MaryRose
Conversion disorder is included as a somatoform disorder under the general classification of hysterias in the Diagnostic and Statistical Manual of Mental Disorders of the American Psychiatric Association, Fourth Edition (DSM-IV). Although defined as a condition that presents as an alteration or loss of a physical function suggestive of a physical disorder, conversion disorder is more precisely understood as the expression of an underlying psychological conflict or need.
The presence of the psychological factor usually is not apparent at onset but becomes evident in the history when a cause-effect relationship between an environmental event or stressor and the onset of the symptom is discovered. The symptoms are not intentionally produced but are the result of unintentional motives. This condition is not considered under voluntary control and, after appropriate medical evaluation, cannot be explained by any physical disorder or known pathological mechanism.
Clinical descriptions of conversion disorder date to almost 4000 years ago; the Egyptians attributed symptoms to a "wandering uterus." In the 19th century, Paul Briquet described the disorder as a dysfunction of the CNS. Freud first used the term conversion to refer to the substitution of a somatic symptom for a repressed idea.
Pathophysiology: The nature and character of presenting symptoms can range the entire field of clinical neurology. A conversion reaction can be entertained in the differential diagnosis of any neurological syndrome. Reactions usually are characterized by symptoms that suggest lesions in the motor or sensory pathways of the voluntary nervous system. Most commonly reported symptoms are weakness, paralysis, sensory disturbances, pseudoseizures, and involuntary movements such as tremors. Symptoms more often affect the left side of the body. This loss or distortion of neurologic function cannot adequately be accounted for by organic disease. Involvement of the corticofugal inhibitory system has been suggested. Symptoms specifically excluded are those limited to pain or sexual functioning or those due to somatization disorder or schizophrenia.
Diagnostic criteria for conversion disorder as defined in the DSM-IV are as follows:
One or more symptoms or deficits are present that affect voluntary motor or sensory function that suggest a neurologic or other general medical condition.
Psychologic factors are judged to be associated with the symptom or deficit because conflicts or other stressors precede the initiation or exacerbation of the symptom or deficit.
The symptom or deficit is not intentionally produced or feigned (as in factitious disorder or malingering).
The symptom or deficit, after appropriate investigation, cannot be explained fully by a general medical condition, the direct effects of a substance, or as a culturally sanctioned behavior or experience.
The symptom or deficit causes clinically significant distress or impairment in social, occupational, or other important areas of functioning or warrants medical evaluation.
The symptom or deficit is not limited to pain or sexual dysfunction, does not occur exclusively during the course of somatization disorder, and is not better accounted for by another mental disorder.
According to psychodynamic theory, conversion symptoms seem to be maintained by operant conditioning. The person derives "primary gain" by keeping an internal conflict or need out of awareness. The symptom has a symbolic value that is a representation and partial solution of a deep-seated psychological conflict.
According to learning theory, conversion disorder symptoms are a learned "maladaptive response to stress." Patients achieve "secondary gain" by avoiding activities that are particularly offensive to them, thereby gaining support from family and friends, which otherwise may not be offered.
Frequency:
In the US: True conversion reaction is rare. Predisposing factors, according to the DSM-IV, include prior physical disorders, close contact to people with real physical symptoms, and extreme psychosocial stress.
Incidence has been reported to be 15-22 cases per 100,000 people. In patients with chronic pain, incidence was 0.22%. Conversion reaction may occur more often in rural settings, where patients may be naive about medical and psychological issues. In one study, high rates were seen in Appalachian males. The disorder is observed more commonly in lower socioeconomic groups and may be more common in military personnel exposed to combat situations.
Cultural factors may play a significant role. Symptoms that might be considered a conversion disorder in the US may be a normal expression of anxiety in other cultures.
One study reports that conversion disorder accounts for 1.2-11.5% of psychiatric consultations for hospitalized medical and surgical patients.
Internationally: At the National Hospital in London, the diagnosis was made in 1% of inpatients. Iceland's incidence of conversion disorder is reported to be 15 cases per 100,000 persons.
Mortality/Morbidity:
Studies report that 64% of patients with conversion disorder show evidence of an organic brain disorder, compared with 5% of control subjects.
An earlier study revealed that a medical explanation eventually emerged from presenting chief complaints in only 7% of patients. Incidence of true neurological disease discovered at a latter date is extremely rare, largely due to advances in diagnostic testing.
Sex: Sex ratio is not known although it has been estimated that women patients outnumber men by 6:1. Many authors have related the development of conversion disorder in women with sexual maladjustment. Other authors disagree, stating that men are as likely to experience conversion symptoms as women. Men seem to be especially prone if they have suffered an industrial accident or have served in the military. In a study at the University of Iowa conducted from 1984-1986, patients diagnosed with conversion disorder were in large part men, especially those with a history of military combat.
Age:
Conversion disorder may present at any age but is rare in children younger than 10 years or in persons older than 35 years. Some studies have reported another peak for patients aged 50-60 years.
In a University of Iowa study of 32 patients with conversion disorder, however, the mean age was 41 years with a range of 23-58 years.
In pediatric patients, incidence of conversion is increased after physical or sexual abuse. Incidence also increases in those children whose parents are either seriously ill or have chronic pain.
The above information was obtained from:
http://www.emedicine.com/emerg/topic112.htm
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