Does anaemia cause dizziness?

Anaemia means the blood has too little haemoglobin or too few red blood cells to carry oxygen effectively. This may make you feel lightheaded, unsteady, weak, or close to fainting, especially when standing or exerting yourself. Some people also notice tiredness, breathlessness, headaches, a fast heartbeat, or paler skin.

Dizziness has many possible causes, including dehydration, low blood pressure, an inner-ear problem, low blood sugar, medication effects, or a heart rhythm problem. The symptom alone cannot identify its cause. A clinician may assess your symptoms and examine you, then use a blood test such as a full blood count to check for anaemia and its pattern.

Sit or lie down until the feeling passes, rise slowly, and avoid driving, climbing, or operating machinery while dizzy. Drink fluids if you may be dehydrated. Arrange a medical assessment if dizziness keeps returning, affects daily activities, or occurs with unusual tiredness, breathlessness, palpitations, or heavy menstrual bleeding. Do not start iron supplements without advice, because treatment depends on the cause and excess iron can be harmful.

Seek urgent medical help for dizziness with fainting, chest pain, severe breathlessness, a new severe headache, confusion, one-sided weakness, trouble speaking, black or bloody stools, or heavy bleeding. These features can signal a problem needing prompt assessment and should not be attributed to anaemia without examination.

You could ask what may be causing the dizziness, whether blood tests are appropriate, whether blood loss or nutrition could contribute, and which treatment is suitable. Mention when the dizziness began, what brings it on, how long it lasts, and any medicines or supplements you take.