Autoimmune disease is strongly linked to an excessive immune response that encourages your body to attack itself. The body mistakes healthy cells for harmful threats and produces antibodies to fight them.
One of the most common causes of fatigue is low iron or anemia. The kind of fatigue that results from anemia comes on slowly and is present all day long. It can feel like someone has unplugged you! Anemia is a shortage of either the quality or quantity of blood.