Higher viscosity of the blood
As mentioned, there’s an overproduction of plasma cells by the bone marrow. Thus, there is also an increase in the number of cells in the blood and its viscosity. Symptoms of hyperviscosity usually appear after it is 4 times greater than usual. In these cases, patients start feeling general malaise, mental fogs, headaches, drowsiness, and other physical symptoms such as fever, hazy vision, bruising, and tingling in the skin. As the disease advances, and in susceptible patients, we can also have a higher risk of stroke and heart attacks. Higher viscosity of the blood is also a cause of papilledema, seizures, and hemorrhage in the retina.