Stroke: warning signs, causes, treatment and recovery explained

A stroke is a medical emergency in which part of the brain suddenly loses its blood supply. Recognising the signs and calling for help at once can change the outcome. This review explains what a stroke is, how to spot one, what causes it and how it is treated, using information from the NHS, the US CDC and MedlinePlus.

1. Introduction

A stroke happens when blood stops flowing to part of the brain. The CDC explains that brain cells begin to die within minutes, which can lead to lasting brain damage, long-term disability or death ^[4]. MedlinePlus adds that prompt treatment can save a life and improve the chances of rehabilitation and recovery ^[5].

Stroke is both preventable and treatable, according to the CDC ^[4]. MedlinePlus lists controlling blood pressure and cholesterol among the ways to lower the risk ^[5].

2. Types of stroke

There are three main patterns described by the CDC and MedlinePlus ^{[4, 5]}:

• Ischaemic stroke (spelled ischemic in the United States): a blood clot or other particle blocks a vessel that supplies the brain. This is the most common type, at roughly 80 percent of cases ^[5].
• Haemorrhagic stroke: a brain artery leaks or bursts, and the escaping blood harms brain cells through pressure. High blood pressure and an aneurysm, which is a weak, balloon-like bulge in an artery wall, can lead to this type ^[4].
• Transient ischaemic attack (TIA), or "mini-stroke": blood flow is blocked only briefly. The CDC calls a TIA a warning sign of a future stroke, and doctors cannot tell at first whether symptoms come from a TIA or a major stroke ^[4].

3. Signs and symptoms

The NHS describes the FAST check ^[1]:

• Face: one side of the face may droop, and smiling may be hard.
• Arms: you may not be able to lift both arms and keep them raised because of weakness or numbness in one arm.
• Speech: words may be slurred, or you may sound confused.
• Time: time to call the emergency number.

Other symptoms include weakness or numbness on one side of the body, blurred vision or loss of sight in one or both eyes, trouble finding words, confusion or memory loss, dizziness or falling, a severe headache, and feeling or being sick ^[1]. MedlinePlus adds trouble walking or loss of balance ^[5].

Symptoms can pass after a short time. The NHS stresses that a person may then feel fine but should still get medical help straight away ^[1].

4. Causes and risk factors

The NHS lists conditions that raise the chance of a stroke ^[2]:

• High blood pressure
• Diabetes
• Atrial fibrillation, a condition with fast, irregular heartbeats
• High cholesterol
• A previous TIA

Other factors include age (risk may rise after 50, though a stroke can happen at any age), sickle cell disease, an unhealthy lifestyle, migraines, the combined contraceptive pill, and pre-eclampsia in pregnancy or having recently given birth. The NHS says people from Black or South Asian backgrounds have a higher risk ^[2]. MedlinePlus also names smoking, not enough physical activity, an unhealthy diet, obesity, and alcohol and illegal drug use ^[5].

5. Diagnosis and tests

MedlinePlus explains that clinicians review symptoms and medical history and carry out a neurological exam. Brain imaging with a CT or MRI scan shows the type of stroke. Heart tests such as an electrocardiogram and an echocardiogram look for heart problems or clots that may have caused it ^[5].

6. Treatment and recovery

Treatment depends on the type of stroke, and the hospital team decides what is right. In the first 24 hours the NHS says care may include medicine to dissolve clots (thrombolysis), surgery to remove a clot (thrombectomy), surgery to drain fluid from the brain, or a procedure to relieve pressure inside the skull ^[3]. MedlinePlus notes that clot-dissolving medicine must be given within 4 hours of the start of symptoms, which is why speed matters ^[5]. For a bleed, doctors first find and control the cause, which may involve blood pressure medicines or surgery ^[5].

Recovery begins in hospital with a team of doctors, specialists and therapists ^[3]. Rehabilitation helps people relearn lost skills and work towards independence ^[5]. Long-term medicines often include anticoagulants, which help prevent blood clots, blood pressure medicines and statins, which lower cholesterol ^[3]. Your doctor decides which are suitable.

7. Prevention and self-care

Having a stroke or TIA raises the risk of another one, but the risk can be lowered ^[2]. The NHS suggests:

• Stopping smoking
• Eating a balanced diet
• Exercising regularly
• Cutting down on alcohol
• Keeping up with medicines for conditions such as high blood pressure or diabetes, and talking to a doctor if there are problems with them

MedlinePlus adds keeping a healthy weight and managing stress ^[5].

8. When to see a doctor

Call for emergency help if you think you or someone else is having a stroke, or if you have had stroke signs in the past 24 hours, even if they have stopped ^[1]. The NHS advises not to drive yourself to hospital. Do not wait to see whether symptoms pass.

In an emergency, call your local emergency number (112 in India, 911 in the United States).

9. Conclusion

A stroke is an emergency in which every minute counts for the brain. Learning the FAST signs, treating risk factors such as high blood pressure and diabetes, and acting at once if symptoms appear are the most useful steps for readers. Recovery and long-term care are planned with your own medical team.