Why does vitamin B12 deficiency cause dizziness?

Vitamin B12 helps the body make healthy red blood cells and supports normal nerve function. When there is too little B12, some people develop anaemia, so less oxygen may reach the brain and muscles during activity. This can feel like lightheadedness, a faint feeling, or unsteadiness rather than a spinning sensation.

Dizziness is a common presentation of Vitamin B12 Deficiency. It still has many possible causes, including dehydration, inner-ear problems, medicines, changes in blood pressure, and other forms of anaemia.

Arrange a medical assessment if dizziness is new, recurring, or interfering with daily tasks. A clinician can review your diet, digestive symptoms, medicines, and medical history, then decide whether blood tests are appropriate. Treatment depends on the cause of low B12 and may involve dietary changes, tablets, or injections prescribed for you.

Until you are assessed, rise slowly from sitting or lying down, drink fluids regularly if you can, and avoid driving or working at heights while you feel unsteady.

Seek urgent medical help for dizziness with fainting, chest pain, shortness of breath, a new severe headache, trouble speaking, facial drooping, weakness on one side, or sudden difficulty walking. These features need prompt assessment regardless of a possible B12 problem.

Ask whether your symptoms could reflect anaemia, nerve involvement, or another cause; whether your medicines or diet affect B12 absorption; and how follow-up will show that treatment is working.