Skip to main content

Download this leaflet as a PDF

Leaflet: Minor Head Injuries

This page 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.

Minor head injury

Minor head injury and knocks to the head are common, particularly in children. Following the injury, if the person is awake (conscious), 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.

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 provide information, including symptoms to look out for following a knock to the head.

Things to look out for

Seek medical help quickly if any of the following symptoms occur after a head injury:

  • Drowsiness when you would normally be wide awake
  • The injury was associated with loss of consciousness or penetrating injury to the head
  • Worsening headache – which does not go away with paracetamol
  • Confusion, strange behaviour, and any problems with understanding or speaking
  • Inability to remember events before or after the head injury
  • Unresolving headache
  • Loss of use of part of the body – for example, weakness in an arm or a leg
  • Dizziness, loss of balance or walking strangely
  • 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
  • You have a history of bleeding easily, or are taking medications which thin the blood; or, you have previously had brain surgery.

If none of the above are present, your healthcare professional may still send you to be assessed in accident and emergency. Especially if there are any concerns regarding the diagnosis, there is altered behaviour or irritability (particularly in children) or there is no one to be with you for the first 24 hours of the head injury.

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 them 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 they appear 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.

However, 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 being sick (vomiting)
  • Being irritable and grumpy
  • Tiredness
  • Poor appetite
  • 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.

More information

Other head injury information which may be provided to you:

  • Details of the injury and how severe it is
  • The need for a responsible adult to be with you for the initial 24 hours after their injury
  • How quickly you can expect to recover and what this is likely to involve. This will include when you can return to work or school. Some patients may develop complications later
  • Contact details of where to get further help if any complications occur.
  • Available support organisations.

Some tips and other general advice

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.

Call 111 if you urgently need medical help or advice but it’s not a life-threatening situation.

For less urgent health needs, contact your GP or local pharmacist in the usual way.

Visit the Minor Injuries Unit webpage for more information about this service.

This leaflet can be provided in other formats and languages, please contact us for more information.

Date of creation: July 2021
Date of review: July 2023
Ref: 0276