Numbness or tingling in your hands—often described as “pins and needles”—can be mildly annoying or a sign of something more serious. Common causes include sleeping position, which compresses nerves, and repetitive motions like typing that may lead to carpal tunnel syndrome. A vitamin B12 deficiency or electrolyte imbalance can also affect nerve function.

Other potential causes include diabetes, which can lead to diabetic neuropathy, and spinal issues such as herniated discs that irritate nerves. Autoimmune diseases like rheumatoid arthritis, poor circulation from conditions like Raynaud’s, and cysts or tumors pressing on nerves may also cause tingling. Certain infections, including shingles or Lyme disease, can directly affect the nerves as well.

While occasional numbness is often harmless, persistent symptoms should not be ignored. The tingling may be your body’s way of signaling an underlying condition that needs attention.

Seek immediate medical help if numbness comes with weakness or paralysis, slurred speech, confusion, dizziness, or spreading symptoms. A doctor can help determine the cause and recommend proper treatment. Early diagnosis often leads to better outcomes, especially for conditions like diabetes or vitamin deficiencies.