Chronic Fatigue Syndrome/ME Causes
We often see people who have developed CFS/ME following an infection, such as glandular fever. Other people can identify a period of stress leading up to the start of their illness. A combination of infection and stress is also common. Occasionally, it starts without an obvious trigger.
Researchers are beginning to put together a picture about how the condition develops and the changes which take place in the body as a result of illness. However, this picture is far from complete at present.
A more detailed summary of the current evidence can be found at the Centers for DIsease Control and Prevention website: https://www.cdc.gov/me-cfs/about/possible-causes.html