If your hands “fall asleep” (feel numb, tingling, or have a “pins and needles” sensation), it is not a clear sign that you have cancer. Most of the time, it is caused by temporary pressure on a nerve or blood vessel and goes away within a few minutes.
Here are the most common causes:
- Pressure on a nerve
- Sleeping on your arm or wrist.
- Holding your phone or steering wheel for a long time.
- Sitting or lying in one position for too long.
- Carpal tunnel syndrome
- A common condition where the median nerve is compressed at the wrist.
- Symptoms include numbness and tingling in the thumb, index, middle, and part of the ring finger, especially at night.
- Peripheral neuropathy
- Damage to nerves outside the brain and spinal cord.
- Can be caused by Diabetes, alcohol use, infections, certain medications, or vitamin deficiencies.
- Vitamin B12 deficiency
- Low vitamin B12 can damage nerves.
- Other symptoms may include fatigue, weakness, balance problems, and memory difficulties.
- Cervical radiculopathy
- A pinched nerve in the neck can cause numbness, tingling, or pain that travels down the arm into the hand.
Can cancer cause hand numbness?
Yes, but it is uncommon. Cancer is not a common cause of hands falling asleep. In rare cases, numbness can occur if:
- A tumor presses on a nerve or the spinal cord.
- Cancer spreads to the spine or nervous system.
- Certain chemotherapy drugs cause nerve damage (chemotherapy-induced peripheral neuropathy).
If numbness is due to cancer, there are usually other symptoms as well, such as:
- Unexplained weight loss.
- Persistent severe pain.
- A lump or swelling.
- Ongoing weakness.
- Night sweats or persistent fever (depending on the type of cancer).
When should you see a doctor?
Make an appointment if:
- The numbness happens frequently or keeps coming back.
- It lasts more than a few minutes after changing position.
- It is getting worse over time.
- You have weakness, loss of grip strength, or difficulty using your hand.
- The numbness spreads to other parts of your body.
When is it an emergency?
Seek emergency medical care immediately if the numbness:
- Starts suddenly and affects one side of your body.
- Is accompanied by facial drooping, difficulty speaking, confusion, or trouble walking, as these may be signs of a Stroke.
In summary, hands falling asleep is usually caused by nerve compression and is not a clear sign of cancer. If the symptom is frequent, persistent, or accompanied by other concerning symptoms, it should be evaluated by a healthcare professional.