Comorbid (overlapping) conditions are ailments that frequently occur together. Patients with ME/CFS commonly experience one or more conditions that may appear simultaneously with ME/CFS, occur prior to a diagnosis of ME/CFS, or appear years later. Some of these, like fibromyalgia, have symptoms that are so similar to ME/CFS that it can be hard to distinguish between them. Others, like migraines, may only appear in a subset of ME/CFS patients.
Some overlapping conditions include: