This leaflet is intended for people who have been assessed by a doctor or nurse following a head injury (and for their carers), but who have been allowed home. Always see a doctor or nurse if you are concerned about an injury.
Minor head injuries
Minor head injury and knocks to the head are common, particularly in children. Following the injury, if the person is conscious (awake), and there is no deep cut or severe head damage, it is unusual for there to be any damage to the brain.
However, sometimes a knock to the head can cause damage to the brain or to a blood vessel next to the brain. A damaged blood vessel may bleed into the brain, or more commonly, into the area between the brain and the skull (a 'subdural haemorrhage'). This is uncommon, but can be serious, as a build-up of clotting blood can cause pressure on the brain. See separate leaflet called Subdural haematoma for further detail.
Symptoms of damage or bleeding may not develop for some hours, or even days, after a knock to the head. In rare cases, symptoms from a slow bleed can develop even weeks after a head injury.
This is why 'head injury instructions' are given to people who have had a head injury. These are symptoms to look out for following a knock to the head.
See a doctor quickly if any of the following symptoms occur after a head injury
- Drowsiness when you would normally be wide awake (but see below).
- Worsening headache - which does not go away with paracetamol (but see below).
- Confusion, strange behaviour, any problems understanding or speaking.
- Loss of use of part of the body - for example, weakness in an arm or leg.
- Dizziness, loss of balance or walking strangely.
- Fitting (convulsions) or collapse followed by feeling strange afterwards.
- Any visual problems, such as blurring of vision or double vision.
- Blood or clear fluid leaking from the nose or ear.
- New deafness in one or both ears.
- Unusual breathing patterns.
A note about drowsiness
After a knock to the head, children will often cry, be distressed and then settle down. It is then quite common for them to want to sleep for a short while. This is normal. However, it will appear to be a normal 'peaceful' sleep, and they wake up fully after a nap.
Some parents are afraid to let their children go to sleep if the accident happens just before bedtime. Do let them. Drowsiness means they cannot be roused. If you have a concern, wake the child up after an hour or so. They may be grumpy about being woken up, but that is reassuring. You can then let him or her go back off to sleep again. You can do this a few times during the night if there is particular concern. When asleep, check to see that he or she appears to be breathing normally and is sleeping in a normal position.
A note about headache
It is normal after a knock to the head to have a mild headache. Sometimes there is also tenderness over bruising or mild swelling of the scalp. Some paracetamol or ibuprofen will help. It is a headache that becomes worse and worse which is of more concern.
Some other symptoms that may occur
Some people develop some mild symptoms after a head injury that are not serious and usually go away within two weeks. These can include a mild headache, feeling a bit sick (without vomiting), being irritable and grumpy, tiredness, poor appetite and some difficulty concentrating. These may develop just as a reaction to a knock on the head and not due to bleeding or serious injury. However, if you have any doubt about a symptom following a head injury then it is best to get it checked out by a doctor as soon as possible. Also, see a doctor if you feel that you have not completely recovered after two weeks.
Some tips and general advice
- If at all possible, do not stay at home alone for the first 48 hours after being assessed for a head injury.
- Show a relative or friend this advice leaflet so they too know what symptoms to look out for.
- Stay within easy reach of a telephone and medical help for the following few days.
- Do not take any alcohol or drugs for the following few days.
- Do not take sleeping tablets or sedatives unless prescribed by a doctor.
- Discuss with your doctor about playing contact sports such as rugby or football. It is often advised that you should not play contact sports for three weeks following a head injury.
- Do not drive, ride a motorbike or bicycle, or operate machinery until you feel completely recovered.
Further help and information
Headway - the brain injury association
Further reading & references
- Triage - assessment - investigation and early management of head injury in infants, children and adults; NICE Clinical Guideline (September 2007)
Disclaimer: This article is for information only and should not be used for the diagnosis or treatment of medical conditions. EMIS has used all reasonable care in compiling the information but make no warranty as to its accuracy. Consult a doctor or other health care professional for diagnosis and treatment of medical conditions. For details see our conditions.
Dr Tim Kenny
Dr Michelle Williams
Dr John Cox