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Frequency. 0.6-2.5/100,000 cases per year. [ 2] In hematology, essential thrombocythemia ( ET) is a rare chronic blood cancer ( myeloproliferative neoplasm) characterised by the overproduction of platelets (thrombocytes) by megakaryocytes in the bone marrow. [ 3] It may, albeit rarely, develop into acute myeloid leukemia or myelofibrosis. [ 3]
Dizziness is broken down into four main subtypes: vertigo (~25–50%), disequilibrium (less than ~15%), presyncope (less than ~15%), and nonspecific dizziness (~10%). [5] Vertigo is the sensation of spinning or having one's surroundings spin about them. Many people find vertigo very disturbing and often report associated nausea and vomiting. [6]
Balance disorder. A balance disorder is a disturbance that causes an individual to feel unsteady, for example when standing or walking. It may be accompanied by feelings of giddiness, or wooziness, or having a sensation of movement, spinning, or floating. Balance is the result of several body systems working together: the visual system (eyes ...
Central vertigo is less common and is caused by a problem in the brain. It might be in the brain stem. It could also be in the back part of the brain, called the cerebellum.
Vertebrobasilar insufficiency ( VBI) describes a temporary set of symptoms due to decreased blood flow ( ischemia) in the posterior circulation of the brain. The posterior circulation supplies the medulla, pons, midbrain, cerebellum and (in 70-80% of people) supplies the posterior cerebellar artery to the thalamus and occipital cortex. [ 1]
1 per 1000 people [ 8] Pernicious anemia is a disease where not enough red blood cells are produced due to a deficiency of vitamin B 12. [ 5] Those affected often have a gradual onset. [ 5] The most common initial symptoms are feeling tired and weak. [ 4]
Benign paroxysmal positional vertigo ( BPPV) is a disorder arising from a problem in the inner ear. [ 3] Symptoms are repeated, brief periods of vertigo with movement, characterized by a spinning sensation upon changes in the position of the head. [ 1] This can occur with turning in bed or changing position. [ 3]
Conversion disorder (CD), or functional neurologic symptom disorder, is a diagnostic category used in some psychiatric classification systems.It is sometimes applied to patients who present with neurological symptoms, such as numbness, blindness, paralysis, or fits, which are not consistent with a well-established organic cause, which cause significant distress, and can be traced back to a ...