Symptoms
At the onset of the disorder, the signs and symptoms tend to be unspecific. A noticeable reddening of the face can give the impression that the affected person is actually very healthy. When the red blood cell count reaches a critical number, the flowability of the blood decreases leading to restricted blood circulation. This causes a blue coloration of the skin (cyanosis).
Other symptoms may include:
- Itching all over the body, especially when showering or bathing (aquagenic pruritus)
- Hypertension
- Headache
- Dizziness
- Painful blood microcirculation disorder of the hand and foot
- Ringing in the ear (tinnitus)
- Nose bleeds
- Visual impairment