Dizziness covers a range of sensations — spinning, swaying, light-headedness, the feeling that the floor is moving. The first job is to work out which one you mean, because the causes differ. A careful history and a few in-clinic balance tests narrow it down quickly.
True vertigo — a spinning sensation — usually comes from the inner ear. The most common single cause is BPPV (benign paroxysmal positional vertigo), a brief spin triggered by head movement that is treated in minutes with a repositioning manoeuvre.
Light-headedness, by contrast, more often reflects blood-pressure changes, dehydration, or anxiety. Knowing which type you have is half the diagnosis.
Sudden severe spinning, dizziness with hearing loss, dizziness with neurological symptoms (weakness, slurred speech, visual disturbance), or frequent falls should be assessed urgently. Most other forms of dizziness can be evaluated on a routine appointment.