Weakness on one side of the body
Weakness on one side of the body, called hemiparesis, means reduced strength in the arm and leg on the same side. When sudden, it is a warning sign of stroke requiring emergency care. Gradual onset may indicate other neurological conditions affecting the brain or spinal cord.
Conditions that commonly cause weakness on one side of the body
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Common Causes of Weakness on one side of the body
- Stroke or transient ischaemic attack (TIA)
- Brain tumour
- Multiple sclerosis
- Brain infection or abscess
- Traumatic brain injury
When to Seek Urgent Medical Care for Weakness on one side of the body
These signs may indicate a serious problem — don't wait, seek medical care right away:
- Sudden one-sided weakness is a medical emergency - call for help immediately. Also seek urgent care for one-sided weakness with speech difficulty, weakness with facial drooping, progressive one-sided weakness over days, weakness with severe headache or confusion.
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