Hemorrhagic stroke info-graphic by the stroke association

This page is about strokes due to bleeding in or around the brain, and how you will be diagnosed and treated.

The information on this page can be accessed in the following formats:

On this page

What is a haemorrhagic stroke?
Bleeding within the brain (intracerebral haemorrhage or ICH)
Bleeding on the surface of the brain (subarachnoid haemorrhage or SAH)
Diagnosing haemorrhagic stroke
Treating haemorrhagic stroke
Recovering from a haemorrhagic stroke
Support after leaving hospital
Who is at risk of a haemorrhagic stroke?

What is a haemorrhagic stroke?

Haemorrhagic stroke is when you have bleeding in or around the brain. The blood supply to part of your brain is cut off, killing brain cells. Damage to brain cells can affect how the body works. It can also change how you think and feel.

It's a less common type of stroke, and around 15% of strokes in the UK are haemorrhagic. The other 85% of strokes are ischaemic (due to a blockage in the blood supply to the brain).

What happens when you have a haemorrhagic stroke?

If you have a haemorrhagic stroke, you will have emergency treatment to reduce bleeding and limit the amount of damage in the brain. Afterwards, you will have support for your recovery including medical treatment and rehabilitation therapy.

The effects of your stroke depend on where the stroke was in your brain, and the amount of damage. For more information, see 'Effects of stroke' later in this guide. You can also find comprehensive information about all the effects of stroke on our effects of stroke webpage.

There are two main types of haemorrhagic stroke

  • Bleeding within the brain (intracerebral haemorrhage, or ICH).
  • Bleeding on the surface of the brain (subarachnoid haemorrhage, or SAH).

Haemorrhagic strokes can have different causes, such as abnormal blood vessels in the brain. There are some things that can make you more likely to have a haemorrhagic stroke, such as high blood pressure, and a build-up of fatty material in your arteries.

Bleeding within the brain (intracerebral haemorrhage or ICH)

Intracerebral haemorrhage (ICH) is where blood leaks out of a blood vessel into the brain tissue, sometimes deep inside the brain. ICH is the most common type of haemorrhagic stroke, and around two thirds of all haemorrhagic strokes are ICH.

Main causes of ICH

Cerebral small vessel disease

Cerebral small vessel disease means having damage to very small blood vessels in your brain. This can lead to blood leaking into the brain tissue, often deep inside the brain. There are two main types:

  • Small vessel disease due to high blood pressure.

High blood pressure (hypertension) is a main cause of small vessel disease in the brain. Over a long period, high blood pressure damages the blood vessels inside your brain, making them stiffen, and causing blockages.

Small areas of damage develop, which look like tiny scars on a brain scan. These damaged areas reduce the blood flow to your brain cells. This can affect your thinking ability and mood, and it's linked to cognitive decline and dementia. It also makes a haemorrhagic stroke more likely to happen.

  • Cerebral amyloid angiopathy (CAA).

This is a common type of small vessel disease where a protein called amyloid beta builds up inside the small blood vessels near the surface of the brain. This damages the blood vessels, making them more likely to bleed. This can cause a haemorrhagic stroke, and can also lead to microbleeds which don't always have obvious symptoms.

It's very common in people with dementia, but you can have CAA without having dementia. Although there aren't any direct treatments for CAA, controlling your blood pressure can help reduce the risk of bleeding in the brain.

Abnormal blood vessels in the brain

Rare abnormalities in the blood vessels of the brain can sometimes cause ICH. These are known as vascular malformations, and they can include tangles of blood vessels or enlarged blood vessels. There are two main types:

  • Arteriovenous malformation (AVM).

In an AVM, the blood vessels carrying blood to and from the brain grow together in a tangle, instead of linking to the full network of smaller blood vessels in the brain. An AVM can reduce blood flow and compress the surrounding brain tissue. Inside the AVM, blood flows at high pressure into weak blood vessels, which can sometimes lead to bleeding.

  • Cavernous malformation, or cavernoma.

A cavernoma is a cluster of enlarged blood vessels, often said to look like a raspberry. It is made up of a series of connected 'bubbles' or caverns, filled with blood. Often these don't cause any symptoms, but the blood vessel walls can be weak, making a bleed more likely.

Bleeding on the surface of the brain (subarachnoid haemorrhage or SAH)

Subarachnoid haemorrhage (SAH) is where blood leaks out of a blood vessel on the surface of the brain, and gets into the protective layer of fluid surrounding the brain. This layer is known as the subarachnoid space.

SAH is the least common type of stroke, and around one in three of all haemorrhagic strokes are SAH (about one in 20 of all strokes).

What is the subarachnoid space?

The brain is surrounded by a double layer of protective membranes, with cerebrospinal fluid in between. This layer of fluid is called the subarachnoid space, and it helps to cushion the brain from injury.

Main causes of SAH

SAH is often due to a burst aneurysm. An aneurysm is a blood vessel that has ballooned out. The walls of an aneurysm are weak, and they sometimes burst, causing bleeding into the layer of fluid around the brain.

Surgery to treat SAH

Surgery for SAH aims to stop the bleeding by sealing the weak area of blood vessel. The procedure used depends on how big the aneurysm is, and where it's located in the brain. Your doctors will discuss the options with you and explain the likely recovery times. If it's an emergency procedure, they will use the method that works best for you and your stroke.

The main surgical procedures to repair a burst aneurysm are:


A fine tube (catheter) is inserted into an artery in the groin and carefully steered up to the aneurysm near the brain. X-rays are used to guide the tube. Tiny platinum coils are passed through the tube, and placed in the aneurysm. More coils are added until the aneurysm is sealed.


Clipping involves removing a small flap of bone from the skull, and using a tiny titanium clip to seal the aneurysm. After the clip is in place, the piece of bone is replaced and the scalp is stitched together.

Do all aneurysms need surgery?

A brain aneurysm is usually only found after you have a stroke. However, it's possible to have a stable aneurysm that never causes a stroke. If you're diagnosed with an aneurysm and haven't had a stroke, or if more aneurysms are found after a stroke, you will be carefully assessed. If it's likely that the aneurysm could cause another stroke, you may be offered surgery.

To help reduce your stroke risk, you'll also be given treatment for high blood pressure, and advice on healthy lifestyle changes such as quitting smoking and losing weight.

How does an aneurysm happen?

An aneurysm can be present from birth, or it can develop later in life. Some of the causes include:

Autosomal dominant polycystic kidney disease (ADPKD)

A kidney condition called autosomal dominant polycystic kidney disease (ADPKD) can also make someone more likely to have an aneurysm in the brain. Around one in every 20 people with ADPDK may develop an aneurysm.

Body tissue disorders

Some rare disorders affecting the connective tissues in your body can make you more likely to have a brain aneurysm. Connective tissues are part of the structure of blood vessels and other tissues like skin and tendons. Body tissue disorders including Ehlers-Danlos syndrome, and Marfan syndrome.

Coarctation of the aorta

If someone is born with narrowing of the main artery in their body (the aorta) it can make a brain aneurysm more likely to develop.

Other risk factors

Other things like smoking and high blood pressure can increase your chances of developing a brain aneurysm. See 'Who is at risk?' below.

Diagnosing haemorrhagic stroke


The most typical symptom of a haemorrhagic stroke is a sudden, severe headache, sometimes called a thunderclap headache. This is especially likely with a subarachnoid haemorrhage (SAH) but it can also happen with an intracerebral haemorrhage (ICH). Other common symptoms are a stiff neck, nausea and vomiting. You can also have any of the signs of stroke in the FAST test.

Thunderclap headache

People describe a thunderclap headache as the worst pain they have ever had, and like being hit on the head. If you or someone you know has a thunderclap headache, even if it goes away by itself or with painkillers, you should call 999.

Tests and checks for diagnosing stroke

When someone is taken to hospital with a suspected stroke, a brain scan should be carried out urgently and if possible within one hour of arriving in hospital. The scan could be either a computed tomography (CT) or magnetic resonance imaging (MRI) scan. Scans can help doctors decide if you have had a stroke, and if you need other tests.

Other tests and checks for haemorrhagic stroke include:

  • Computed tomography (CT) scan: shows if there is bleeding in or around the brain.
  • Lumbar puncture: This looks for blood in the cerebrospinal fluid (the fluid around your brain and spinal cord), which can be a sign of bleeding around the brain (subarachnoid haemorrhage). The fluid is taken from your lower spine using a very thin needle, and it's done under local anaesthetic.
  • Digital subtraction angiogram or catheter angiogram: this uses X-rays to find the burst blood vessel. A fine tube called a catheter is put into an artery, usually in the groin. A liquid called a contrast, or dye, is injected into the blood to make the blood vessels show up on an X ray and find any bleeding.

Treating haemorrhagic stroke


After an SAH, the blood vessels in the brain can become narrowed, reducing the blood flow in the brain (vasospasm). This causes more stroke symptoms and can be very serious. Vasospasm can happen from around a day to three weeks after the stroke. To prevent it, you may be given a drug called nimodipine for about three weeks.

If you are taking warfarin (a blood-thinning medication), you may be given medication to reverse the effects.

If you have high blood pressure, you will be given medication to bring it down.

You will be offered painkillers to help with the severe headache associated with an SAH.


As well as surgery to repair aneurysms, other procedures can sometimes be used to deal with the impact of haemorrhagic stroke on the brain.

Procedure to relieve pressure on the brain (craniotomy)

Occasionally, pressure can build up inside the skull due to bleeding or swelling of the brain. A craniotomy is a surgical procedure where part of the skull is removed to reduce pressure on the brain, and allow the surgeon to repair damaged blood vessels.

Shunt surgery for hydrocephalus (excess fluid in the brain)

A subarachnoid haemorrhage (SAH) can sometimes lead to a dangerous build-up of fluid around the brain, known as hydrocephalus. This happens when the flow of cerebrospinal fluid that normally surrounds the brain and spinal cord is disrupted. Symptoms include headache and vomiting, as well as other stroke-like symptoms.

The main treatment for hydrocephalus is shunt surgery. A shunt is a thin tube implanted in the brain to drain the fluid away to another part of your body. There is a valve attached, which you can feel under the skin on your scalp.


Some people have a seizure after a haemorrhagic stroke. Having a seizure doesn't mean you will go on to develop epilepsy. You will be assessed to help decide the best treatment for you, which might include epilepsy medication, depending on your age and your risk of developing epilepsy.

For more information about seizures and epilepsy after stroke visit our epilepsy webpage.

Headaches after haemorrhagic stroke

While you are recovering from a haemorrhagic stroke or treatment such as surgery, you might have headaches which can often be treated with painkillers. Ask your GP or pharmacist for advice about what type of painkillers you can use.

Some people also report strange sensations in their brain after a SAH, like running water or a tickling feeling on their brain. These are quite common and usually pass in time.

If you have a very sudden, severe headache or a headache that doesn't go away, seek medical attention urgently.

Find more information about headaches after a stroke visit our headaches webpage.

Recovering from a haemorrhagic stroke

Everyone recovers differently. Some people recover fully, and other people will have health problems or a disability. The fastest recovery takes place in the first few months. After that progress can be slower, but you can continue to improve for months or years after a stroke.

How will my stroke affect me?

The effects of a stroke are unique to each individual. A stroke can affect any part of your body, as well as your communication, emotions, and memory and thinking. The main effects of stroke include:

  • Movement and balance problems.
  • Communication problems.
  • Memory, concentration and thinking problems (cognition).
  • Problems being able to notice things to one side (spatial neglect).
  • Vision problems.
  • Swallowing problems.
  • Bladder and bowel problems.
  • Fatigue.

Find out more about all the effects of stroke here.

Rehabilitation and recovery

From 24 hours after your stroke, you will be helped to start moving around, if it is safe for you to do so.

You should receive rehabilitation soon after your stroke. It may begin in hospital and should carry on at home if you need it. Rehabilitation is part of your recovery. It means trying to restore function to as near normal as possible, and helping you adapt to disability

During rehabilitation, the therapist assesses you, and designs treatment tailored to your needs. Depending on the type of therapy, you may have exercises to practise. You may work towards building up stamina, or learn new ways of doing things.


Although brain cells that have been severely damaged or have died can't grow back, the brain can re-wire itself, allowing you to relearn things like walking, speech and swallowing. This is called neuroplasticity. Neuroplasticity is the process that happens in the brain when you do rehabilitation therapy. By repeating the therapy activities, your brain starts to form new connections, allowing you to improve.

Support after leaving hospital

Hospital discharge

When you are able to leave hospital, the discharge process should ensure that you get all the support you need. You and your family will be involved in planning your discharge. The discharge plan covers:

  • Rehabilitation.
  • Medical treatment.
  • Care at home.
  • Equipment you may need.
  • Follow-up.

Post-stroke review

Around six months after you leave hospital, you should get a review of your progress. This makes sure you are getting the right support if your needs have changed, including rehabilitation. The review is sometimes carried out by a stroke specialist nurse or other stroke professional. In some areas, you may see a Stroke Association Coordinator. If a review does not take place, contact your GP.

Who will support me?

  • Your GP coordinates your care after leaving hospital, and can help with your medical problems or support needs.
  • You might need support from therapists, such as physiotherapists, occupational therapists, speech and language therapists and psychologists.
  • You might have a community stroke nurse.
  • You may have a social worker.
  • Depending on where you live, you may have help from a Stroke Association Coordinator.
  • We have detailed information about support and life after stroke including accommodation, money and benefits, and information for carers on our life after stroke webpage.

Who is at risk of a haemorrhagic stroke?

After a haemorrhagic stroke, you should be given advice about other ways of reducing your risk of another stroke. On top of the main causes of ICH and SAH, there are some things that can affect your risk of a haemorrhagic stroke.


  • Intracerebral haemorrhage (ICH) can happen at any age, but it is more common in people over the age of 70.
  • Subarachnoid haemorrhage can also happen to anyone, but it's more common in people between 45 and 70.

High blood pressure

High blood pressure damages the blood vessels in your brain, and it can make them more likely to bleed. If you have high blood pressure you will be offered blood pressure medication, which can help reduce your risk of another stroke.

Other things you can do to reduce your blood pressure include stopping smoking, being more active, and losing weight if you need to. We have more ideas and practical tips about medication and healthy lifestyle changes.

Blood-thinning medication

Blood-thinning medication is often given to help reduce your risk of blood clots and stroke. It's often given to people who have had an ischaemic stroke (due to a blockage or clot), and people at risk of stroke due to a heart condition such as atrial fibrillation.

This medication gives you a higher risk of bleeding, including a greater risk of a bleed in the brain. If you have a haemorrhagic stroke while taking blood-thinning medication, doctors will carefully assess you to decide if you should stop taking the medication or change to a different type.

If you're worried about side effects, speak to your GP or pharmacist. But don't stop taking medication without advice, as this can put you at risk of a stroke. For more information visit our blood-thinning medications webpage.

Drinking large amounts of alcohol

Regularly drinking more than the safe limits of alcohol can make you more likely to have high blood pressure, and increase your risk of a stroke. We have information about alcohol and stroke on our webpage here.

Illegal drugs

Some illegal drugs such as cocaine, amphetamines and cannabis can raise the risk of a haemorrhagic stroke. If you or someone you know needs help and advice about drugs, you can get confidential advice from the FRANK helpline 0300 123 6600 or live chat on the Talk to Frank website.

Read more about spotting the signs of a stroke here.


By law, you must not drive for a month after a stroke. You might need to tell the DVLA (or DVA if you are in Northern Ireland) about your stroke. Because the rules are different depending what kind of stroke you had, whether you have had surgery, and the kind of driving licence you hold, it is important to find out what you should do. For more information visit our driving webpage.