Hyperviscosity syndrome is a significant increase in blood viscosity caused by increased blood flow dynamics of the emergence of resistance to a series of specific clinical symptoms, expressed as a result of retinal vein extension, the limitations of narrow, bleeding and oozing, causing visual impairment; dizziness, vertigo, deafness, numbness and disturbance of consciousness, severe cases coma; may be the heart, lung, kidney dysfunction; can cause Raynaud's phenomenon and so on.

Patients may have the following common symptoms:
1. Menorrhagia
2. Persistent bleeding after minor procedures
3. Vertigo
4. Hearing loss
5. Paresthesias
6. Spontaneous gum bleeding
7. Epistaxis
8. Rectal bleeding
9. Ataxia
10. Headaches
11. Seizures
12. Somnolence progressing to stupor and coma