The overlap in the clinical presentation of chronic fatigue syndrome (CFS) and Fibromyalgia (FM) suggests to a shared pathophysiology between these two entities. CFS has been associated with an increased prevalence of voice disorders, but its impact on voice in FM patients has not been investigated. Another risk factor for dysphonia in FM patients is mental illnesses. Anxiety and depression are known risk factors for voice disorders, and patients with dysphonia are more likely than the general population to suffer from mental illnesses. However, the adverse effects of anxiety and depression on voice in the context of FM have not been investigated. Further research is needed to explore the link between mental illnesses, FM and voice.