Muscle weakness, stiffness, and discomfort. Personality and psychological changes. Dry eyes, mouth. Loss of appetite. Immunological abnormalities may be involved.
Many theories center on an infectious agent, but no such agent has been identified.
Risk Increases With Unknown. Preventive Measures Unknown. Expected Outcome Generally very slow improvement over months or years. Possible Complications None specific to the disorder. Symptoms are usually most severe during the first 6 months.