What Are the Warning Signs of a Brain Stroke?

A stroke causes sudden, focal neurological symptoms that worsen within minutes. The most recognised signs are facial drooping, weakness or numbness in an arm or leg, and slurred or absent speech though it can also present as sudden vision loss, a severe unexplained headache, or loss of balance. Every minute of delay costs roughly 1.9 million neurons, which is why acting immediately determines how much function a patient recovers.

According to Dr. Guruprasad Hosurkar,a leading neurologist in Bangalore, “Stroke is the most time-critical neurological emergency we treat. Patients who arrive within the first three to four and a half hours are candidates for thrombolysis, but most families wait and watch, losing the only window where we can actually reverse the damage.”

The FAST acronym is the most widely used and clinically validated tool for rapid stroke recognition at home or in public. It’s not exhaustive, but it catches the majority of strokes fast enough to matter.

• Face: Ask the person to smile if one side of the face droops or doesn’t move symmetrically, that’s a clear stroke signal requiring immediate emergency response.
• Arms: Ask them to raise both arms simultaneously if one drifts downward or can’t be raised at all, the motor cortex or its pathways on the opposite side of the brain are likely affected.
• Speech: Ask them to repeat a simple sentence slurred words, garbled speech, or complete inability to speak or understand language all point to involvement of the dominant hemisphere’s language areas.
• Time: The moment any one of these signs appears, call emergency services immediately don’t wait to see if it resolves, don’t drive to a clinic, don’t give food or water, because thrombolysis has a hard time cutoff that passes faster than most families realise.

FAST covers the core presentation, but stroke can also show up as sudden vision loss in one or both eyes, severe vertigo with inability to walk, or the worst headache of someone’s life from a subarachnoid haemorrhage. Learn more about brain stroke treatment options and what happens after a patient reaches hospital in time.

Not every stroke looks like the textbook FAST presentation. Posterior circulation strokes and TIAs in particular are frequently dismissed as something less serious.

• Sudden severe headache: A headache described as the worst of someone’s life, coming on in seconds rather than minutes, is a haemorrhagic stroke or subarachnoid bleed until proven otherwise not a migraine, not stress, and not something to sleep off.
• Vertigo with neurological features: Isolated vertigo is usually inner ear disease, but vertigo that comes with double vision, facial numbness, limb weakness, or inability to walk straight points to the posterior fossa and needs emergency imaging the same day.
• Transient symptoms that resolve: A TIA, or mini-stroke, causes the same focal deficits as a full stroke but lasts under 24 hours and resolves on its own most people ignore it, but TIA carries up to a 10% risk of full stroke within 48 hours and needs urgent evaluation.
• Sudden confusion or memory gap: Abrupt disorientation, inability to recognise familiar people or places, or a gap in memory with no prior seizure or psychiatric history can be the presenting feature of a stroke affecting the temporal lobe or thalamus.

Strokes that get dismissed in the first hour are the ones that leave permanent deficits. This blog on when vertigo is a sign of something serious explains how to tell vestibular causes apart from central neurological emergencies like stroke.

Dr. Guruprasad Hosurkar holds an MBBS, MD in Internal Medicine, and DNB in Neurology, and leads the Neurology Department at KIMS Hospital, Mahadevapura, with over 22 years of experience managing acute neurological emergencies including ischaemic and haemorrhagic stroke. As a neurologist with specialist training across stroke, movement disorders, and vestibular disease, he assesses each presentation individually rather than applying a generic protocol. 

Patients who reach him within the golden hour leave with outcomes that patients who waited simply don’t get. That window doesn’t reopen.