What Causes Hand Numbness? Common Reasons and When to See a Doctor

Hand numbness can happen for many reasons, ranging from temporary pressure on a nerve to conditions that need medical attention. The sensation may feel like tingling, “pins and needles,” reduced feeling, or weakness in the hand or fingers.

Common causes of hand numbness

Pressure on a nerve
- Sleeping on your arm or keeping your wrist in one position for too long can temporarily compress nerves.
- Symptoms often improve after changing position.
Carpal tunnel syndrome
- Compression of the median nerve at the wrist.
- Often causes numbness or tingling in the thumb, index, middle, and part of the ring finger, especially at night.
Neck problems
- Nerves traveling from the neck to the arm can become irritated by conditions such as a pinched nerve or disc problems.
- Symptoms may include neck pain, arm pain, or hand tingling.
Diabetes-related nerve damage
- High blood sugar over time can damage nerves and cause numbness, often starting in the hands or feet.
Vitamin deficiencies
- Low levels of certain nutrients, especially vitamin B12, can affect nerve function.
Injuries
- Damage to the wrist, hand, arm, or neck can affect nerves and sensation.
Circulation problems
- Reduced blood flow can sometimes cause numbness, coldness, or color changes in the fingers.
Other neurological conditions
- Less commonly, conditions affecting the brain, spinal cord, or nerves can cause numbness.

When to seek medical help urgently

Get emergency care if numbness:

Starts suddenly, especially on one side of the body
Occurs with face drooping, trouble speaking, confusion, severe headache, dizziness, or weakness (possible stroke symptoms)
Happens after a serious injury
Is accompanied by chest pain or shortness of breath