Polycythemia (also known as polycythaemia or polyglobulia) is a disease state in which the proportion of blood volume that is occupied by red blood cells increases. Blood volume proportions can be measured as hematocrit.It can be due to an increase in the number of red blood cells (absolute polycythemia) or to a decrease in the volume of plasma (relative polycythemia).lood volume proportions can be measured as hematocrit. It can be due to an increase in the number of red blood cells (absolute polycythemia) or to a decrease in the volume of plasma (relative polycythemia).
1 Some 20% of adolescents with major depression develop bipolar disorder within five years of the onset of depression. ( 2 Birmaher, B., Childhood and Adolescent Depression: A Review of the Past 10 Years.. 3  Part I, 1995).
Peopleâs symptoms and the severity of their mania or depression vary widely. Although bipolar disorder can occur at any point in life, the average age of onset is 25. Every year, 2.9% of the U.S. population is diagnosed with bipolar disorder, with nearly 83% of cases being classified as severe.evere bipolar episodes of mania or depression may also include psychotic symptoms such as hallucinations or delusions. Usually, these psychotic symptoms mirror a personâs extreme mood. Someone who is manic might believe he has special powers and may display risky behavior.