Some people may take supplements if they have a deficiency. The NHS says general symptoms of anaemia may include extreme tiredness, breathlessness, feeling faint and headaches.
You may also notice that you have pale skin, noticeable heartbeats, are hearing sounds coming from inside the body, rather than from an outside source, as well as noticing a loss of appetite and weight loss.
If you have anaemia caused by a vitamin B12 deficiency, you may have other symptoms that affect your behaviour.
The NHS says you may notice irritability, depression, changes in the way you think, feel and behave, and a decline in your mental abilities, such as memory, understanding and judgement.