It is caused by displacement of otoconia into the posterior semi circular canal and it manifests as a rotational dizziness. The patient complains that the surroundings seem to rotate.
The key distinguishing feature is that it is positional. There is severe vertigo only in same positions of the head (i.e. right or left). In addition to vertigo, symptoms of BPPV may include dizziness (lightheadedness), imbalance, difficulty concentrating, and nausea.
Inflammation of the vestibular labyrinth(a system of intercommunicating cavities & canals in the inner ears). Clinically, patient experiences disturbances of balance and hearing to varying degrees and may affect 1 or both ears.
Vestibular neuritis is acute, sustained dysfunction of the peripheral vestibular system which presents as nausea, vomiting, and vertigo, and normal hearing. Vestibular neuritis is generally distinguished from labyrinthitis by preserved auditory function.
This results from decreased blood supply to brain from its posterior vascular supply .There is a sudden onset of dizziness with imbalance while walking along with nausea and vomiting. In advanced stages loss of consciousness may occur
Giddiness or lightheadedness, a very common symptom seen in practise, is a term used to describe a sensation of altered orientation in space usually described by the patient as “chakar”. Giddiness, lightheadedness, disequilibrium and syncope are often mistaken for one another; most often caused by relative decrease in sensorium and are caused by different conditions.