Cancer

ME/CFS
A study by Chang et al. (2012) found that a history of chronic fatigue syndrome was associated with an increased risk of certain Non-Hodgkin lymphomas, specifically diffuse large B cell lymphoma, marginal zone lymphoma, and B cell Non-Hodgkin lymphoma not otherwise specified.

Notable studies

 * 2012, Chronic fatigue syndrome and subsequent risk of cancer among elderly U.S. adults