Hemiplegia means paralysis on one side of the body. It can affect the arm, leg, and sometimes the face on the same side.
What is hemiplegia?
Hemi means half, and plegia means paralysis. In plain English, it means one side of the body is not moving properly or may not move at all.
It can happen because of a serious problem affecting the brain, such as Stroke, or after other major neurological injury or illness.
What might you notice?
Possible signs include:
- one arm or leg not moving
- a marked difference between the two sides of the body
- facial drooping on one side
- trouble walking or standing
- sudden loss of strength on one side
Is hemiplegia the same as weakness?
Not exactly. Weakness means the muscles still work but not normally. Hemiplegia usually means much more severe loss of movement, sometimes close to complete paralysis on one side.
That is why it should be taken seriously if it starts suddenly.
Why does hemiplegia matter in first aid?
Sudden hemiplegia can be a sign of a medical emergency.
It may happen with Stroke or a Transient Ischaemic Attack (TIA), so urgent medical help is important.
What should you do in first aid?
- Treat it as urgent.
- Call
000straight away. - Keep the person safe and still.
- Watch breathing and responsiveness.
- Note when the signs started, if you can.
If the person becomes Unresponsive and is not breathing normally, start CPR.
How does this fit with neurological assessment?
During a Neurological Assessment, one-sided loss of movement is an important warning sign. It can help show that something serious is affecting the brain or nervous system.
Quick answer
Hemiplegia means paralysis on one side of the body. If it starts suddenly, it can be a sign of stroke or another serious brain problem and needs urgent medical attention.
Sources reviewed
- Healthdirect: stroke and the FAST test
- Stroke Foundation: signs of stroke
- Triple Zero: official emergency calling guidance
Reviewed against current Australian neurological, first aid and emergency guidance by the First Aid Glossary Editorial Team. This article is general information and does not replace emergency-operator directions, professional medical advice or hands-on first aid training.
