Comorbid condition happens when two or more conditions occur in a single person and these conditions occur all at the same time. Fibromyalgia (FMS) and Chronic Fatigue Syndrome (CFS) are conditions that are considered distinct. Although their symptoms are sometimes overlapping and they share a lot in common, they are two different medical conditions.
Both fibromyalgia and chronic fatigue syndrome comes with a lot of co-occurring symptoms. These include sleep problems, pain disorders, major depression, digestive problems, nervous system disorders, as well as menstrual problems. Knowing whether a patient have a co-existing condition can help he or she receive better treatment and pain relief.