However, a sudden headache that is dramatically different from a person's usual headaches must not automatically be attributed to migraine or stress.
Emergency evaluation is especially important when the pain begins abruptly, is unusually intense, or occurs with vomiting, neck stiffness, fainting, confusion, weakness, or other neurological changes.
Do not wait to see whether a thunderclap headache improves on its own.
Call your local emergency number or seek emergency medical care immediately.
3. Warning Sign Number Two: Sudden Weakness or Numbness
One of the best-known signs of stroke is sudden weakness or numbness affecting the face, arm, or leg, particularly on one side of the body.
A person may suddenly find that one arm feels unusually heavy or that one leg does not respond normally.
They may struggle to hold a cup, lift an object, stand steadily, or walk without assistance.
Facial weakness can also occur. One side of the mouth may droop, or the person's smile may appear uneven.
Why Does This Happen?
Different areas of the brain control different bodily functions.
When blood flow to a particular region is interrupted, the functions controlled by that area may be affected.
A stroke involving pathways responsible for movement can therefore cause weakness or loss of coordination on one side of the body.
The exact symptoms depend on the location and extent of the brain injury.
What Should You Do?
Do not ask the person to exercise the affected limb to see whether it improves.
Instead, recognize the sudden change and seek emergency medical assistance.
Even if the weakness or numbness disappears after a few minutes, urgent evaluation is still necessary.
Temporary neurological symptoms can occur during a transient ischemic attack, or TIA. A TIA may indicate an increased risk of a future stroke and should be treated as a medical emergency.
Never assume that a person is safe simply because they have recovered their normal movement.
4. Warning Sign Number Three: Difficulty Speaking or Understanding Language
A stroke can interfere with the brain regions responsible for language and communication.
A person may suddenly have trouble finding words, producing understandable speech, or understanding what other people are saying.
Their speech may sound slurred, confused, or unusually slow.
In some cases, the person knows what they want to communicate but cannot express it clearly.
In others, they may have difficulty understanding simple instructions or following a conversation.
Why Is This Symptom Important?
Speech difficulties can result from several medical conditions, but sudden onset is particularly concerning.
A stroke may affect the networks responsible for coordinating the muscles used in speech or processing language.
These problems can appear even when the person is awake and appears otherwise alert.
A young adult who suddenly begins speaking incoherently or cannot understand familiar words needs immediate assessment.
Do Not Wait for Additional Symptoms
Stroke symptoms do not always appear together.
A person may have a speech problem without severe headache, obvious facial drooping, or complete paralysis.
One sudden neurological symptom can be enough to justify an emergency response.
Do not delay while waiting for a second symptom to appear.
5. Warning Sign Number Four: Sudden Vision Problems
Sudden changes in vision may indicate a problem involving the eyes, the optic pathways, or the brain.
Stroke can sometimes cause loss of vision in one eye, loss of part of the visual field, double vision, or difficulty coordinating eye movements.
A person may suddenly be unable to see objects on one side or may bump into things because they cannot perceive part of their surroundings.
Some people experience visual symptoms alongside dizziness, difficulty walking, or other neurological changes.
What Makes These Symptoms Concerning?
A sudden visual disturbance that differs from a person's usual experience deserves urgent assessment, particularly when it begins abruptly or occurs with other neurological symptoms.
Migraine can also cause visual disturbances, sometimes called an aura. However, it is not safe to assume that a new visual problem is caused by migraine without considering other possibilities.
A sudden loss of vision, new double vision, or visual disturbance accompanied by weakness or difficulty speaking should be treated as an emergency.
Do not drive yourself to the hospital if you may be experiencing a stroke.
Call emergency services and explain when the symptoms began or when the person was last known to be well.
6. Warning Sign Number Five: Sudden Dizziness, Loss of Balance, or Difficulty Walking
Dizziness is common and can result from dehydration, inner-ear disorders, medication effects, low blood pressure, and many other conditions.
However, a stroke affecting the cerebellum or brainstem can cause sudden problems with balance, coordination, and movement.
A person may suddenly be unable to walk straight, stand securely, or coordinate their limbs.
They may experience severe dizziness together with double vision, slurred speech, weakness, or difficulty swallowing.
When Is Dizziness an Emergency?
Dizziness alone does not necessarily indicate a stroke. The context and accompanying symptoms matter.
Nevertheless, sudden, severe dizziness accompanied by new difficulty walking, coordination problems, double vision, weakness, or speech changes requires emergency assessment.
Strokes affecting the back of the brain can sometimes present differently from the more familiar pattern of facial drooping and arm weakness.
This means that the absence of classic symptoms does not completely exclude a stroke.
If a person suddenly loses the ability to walk normally or develops multiple neurological symptoms, do not assume the problem is simply fatigue or dehydration.
7. Remember the FAST Stroke Recognition Test
A simple way to recognize several major stroke warning signs is the FAST test.
F — Face:
7. Remember the FAST Stroke Recognition Test
A simple way to recognize several major stroke warning signs is the FAST test.
F — Face: