What Causes Fibromyalgia Low-grade Fever
It is unclear what causes low-grade fever in fibromyalgia since there is a lack of research done on this subject. However, there are a few theories:
A response to psychological stress.
According to a 2013 study, psychological stress can trigger low-grade fever in those suffering from chronic fatigue syndrome (CFS). In the study, the temperature of a CFS participant increased by 1°C after going through a stress interview. Researchers concluded that low-grade fever can be caused by psychological stress. Since many fibromyalgia patients may also suffer from CFS, if not, persistent fatigue, it is likely that stress can also contribute to low-grade fever in fibromyalgia.
Weak immune system to fight infections which cause low-grade fever
Those who are suffering from fibromyalgia usually have a weak immune system. Hence, they can easily pick up infections during fibromyalgia flares. As mentioned infections are a common cause of low-grade fever. Hence low-grade fever in fibromyalgia may be due to infections or cold which the patient picked up.