A cannula is a short, thin tube that is put into a vein in your arm or the back of your hand for treatment. It will be removed before you go home.

A cannula is a short, thin tube that your nurse or doctor puts into a vein in your lower arm or the back of your hand. Having the cannula put in can be a bit uncomfortable, but it does not usually take long. Your nurse may put some anaesthetic cream or spray onto your skin to numb the area first. Your nurse will place a clear dressing over the cannula to make sure it stays in place. The cannula is removed before you go home.

If you feel any discomfort, stinging or notice redness or swelling around the cannula or along your arm while it is used or afterwards, tell your nurse or doctor straight away.