Feeling numbness or tingling in your hands, often described as “pins and needles,” is common and can range from harmless to more serious. In many cases, it happens because of temporary pressure on a nerve, such as from a sleeping position. “Lying on your arm can compress nerves,” and the feeling usually disappears after changing position.

Repeated hand movements can also trigger numbness. Activities like typing for long periods or using tools may cause nerve pressure, sometimes leading to conditions such as carpal tunnel syndrome. Nutritional issues may also play a role. “Vitamin B12 deficiency” can affect nerve health and may cause tingling along with fatigue and weakness. In the same way, “low levels of calcium, sodium, or potassium” can disrupt normal nerve signals.

Some health conditions are more serious causes. “High blood sugar can damage nerves,” leading to diabetic neuropathy, which often causes numbness in the hands and feet. Problems in the neck or spine, such as herniated discs, may also irritate nerves and create symptoms that spread down the arms.

Other possible causes include autoimmune conditions, poor circulation, infections, or growths pressing on nerves. Conditions like “Raynaud’s” can reduce blood flow, while infections such as “shingles or Lyme disease” may directly affect nerve function.

Although numbness is often temporary, ongoing symptoms should not be ignored. Seek immediate medical attention if tingling comes with “weakness or paralysis,” “slurred speech or confusion,” or “dizziness or spreading numbness.” While these sensations are sometimes harmless, persistent or severe symptoms may signal an underlying condition that requires medical evaluation and treatment.