Sign 1: Sudden Weakness or Paralysis on One Side
One arm drops without warning. One leg gives out mid-step. This unilateral weakness, affecting the face, arm, or leg on a single side of the body, is the most reported first symptom of ischemic stroke. The brain's motor cortex controls the opposite side of the body, so a clot or bleed in the left hemisphere typically produces right-side weakness and vice versa. A 2021 study published in The Lancet Neurology found that limb weakness was present in over 70% of confirmed stroke cases at hospital admission across South Asian populations, including India. Do not sit it out. Do not attribute it to tiredness. Get to a hospital.
Sign 2: Face Drooping on One Side
Ask the person to smile. If one side of the face doesn't move, or pulls downward while the other side rises normally, that asymmetry is a red flag. Facial drooping happens when the nerve pathways controlling facial muscles are cut off by a blocked or burst vessel. The FAST acronym used by neurologists worldwide encodes this as the F: Face drooping. The Indian Council of Medical Research (ICMR) has specifically cited FAST awareness as critically low in tier-2 and tier-3 Indian cities, where stroke mortality rates run significantly higher than in metro centres with neurology units on call.
Sign 3: Arm Drift
Ask the person to raise both arms and hold them out, eyes closed, for ten seconds. If one arm drifts downward involuntarily, that is a positive pronator drift test, a standard neurological screen used in emergency rooms. This is the A in FAST. It takes ten seconds to perform and requires nothing except your hands. In a country where the average time between stroke onset and hospital arrival in India runs between three and six hours according to ICMR data, performing this test at home and recognising what it means can compress that gap.
Sign 4: Sudden Slurred or Confused Speech
The person may speak in words that don't connect, repeat a phrase without knowing it, or produce sounds that aren't words at all. They may understand what you say but be unable to respond coherently. This is aphasia, a direct result of stroke affecting the brain's language centres, most commonly Broca's area in the left frontal lobe. The S in FAST stands for Speech. Slurred speech after alcohol is familiar. Slurred speech in someone who hasn't been drinking, appearing without warning, is a medical emergency. The distinction matters.
Sign 5: Sudden Vision Loss or Double Vision
A stroke affecting the posterior circulation, the vertebral and basilar arteries supplying the back of the brain, frequently produces visual symptoms: sudden blackout in one eye, double vision, or loss of half the visual field in both eyes. Patients often describe it as a curtain being drawn across part of their sight. This symptom is frequently misread as an eye problem and patients present to ophthalmologists first, losing critical time. The golden hour for stroke treatment, the window in which clot-busting thrombolysis or mechanical thrombectomy can restore blood flow with minimal permanent damage, is typically counted as the first four and a half hours, but outcomes improve sharply when intervention happens within sixty minutes of symptom onset.
Sign 6: Sudden Severe Headache With No Known Cause
A hemorrhagic stroke, caused by a burst blood vessel rather than a clot, often announces itself as the worst headache of the person's life, arriving without warning, with no preceding tension or migraine history. Neurologists call this a thunderclap headache. It can be accompanied by neck stiffness, sensitivity to light, or sudden vomiting. Unlike a tension headache that builds over hours, this one peaks within seconds. If someone describes their headache this way, the phrase alone is enough to call an ambulance.
What to Do in the First Minute
Call emergency services immediately, in India, dial 112. Do not give the person food or water; swallowing reflex is often impaired during stroke and aspiration is a real risk. Note the exact time symptoms began. This timestamp is the single most important piece of information the treating neurologist needs to determine whether thrombolysis is still within the safe window. Do not drive the person yourself if an ambulance can reach faster. Keep them still, calm, and lying on their side if they are unconscious. Do not give aspirin unless a doctor instructs it, aspirin is contraindicated in hemorrhagic stroke and giving it without knowing the stroke type can worsen bleeding.
The six signs don't all arrive together. Most strokes announce themselves through one or two of them, which is why any single sudden neurological change, in movement, speech, vision, or sensation, deserves the same urgency as all six combined. The brain running without blood flow doesn't wait for a complete symptom checklist.
