Weakness in one arm or leg
Weakness limited to one arm or leg suggests a problem with the nerve supply or muscles of that specific limb. The cause may be in the brain, spinal cord, peripheral nerve, or the muscle itself. The pattern and onset of weakness help determine the underlying cause.
Conditions that commonly cause weakness in one arm or leg
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Common Causes of Weakness in one arm or leg
- Nerve compression (herniated disc, carpal tunnel)
- Stroke or transient ischaemic attack
- Peripheral nerve injury
- Radiculopathy (pinched nerve root)
- Muscle strain or injury
When to Seek Urgent Medical Care for Weakness in one arm or leg
These signs may indicate a serious problem — don't wait, seek medical care right away:
- Sudden weakness in one limb (possible stroke - seek emergency care), weakness with numbness or tingling, weakness after an injury, progressive weakness worsening over days, weakness with speech or vision changes
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