Here's What It Means When Your Foot Falls Asleep

Numbness in the feet, legs, or hands is often due to nerve problems, says Harvard Health. A common cause is peripheral neuropathy, a condition that affects about 20 million people. Peripheral neuropathy isn't a disease itself but rather a symptom of an underlying disorder, such as diabetes or vascular disease. It can also be a sign of thyroid disease or a side effect of antibiotics and other drugs.

If your foot falls asleep often, your diet might be the culprit. Vitamin B12 deficiency, for example, may cause that pins-and-needles sensation, as well as fatigue, diminished mental focus, anemia, and other symptoms, warns Harvard Health. Since this nutrient occurs mostly in animal foods, vegans and vegetarians are more likely to develop deficiencies. Also, note that bariatric surgery and certain conditions, such as celiac disease, may affect your body's ability to absorb vitamin B12.

Another common cause of numbness in the feet is sciatica, a form of nerve pain that may result from injuries, heavy lifting, diabetes, smoking, or weak core muscles. This condition affects more than 40% of Americans at some point in their lives, reports the Cleveland Clinic. The sciatic nerve runs through the lower back and down through the gluteal muscles, legs, and feet. When irritated, it may trigger that pins-and-needles feeling in any of these areas, including your feet and toes. You may also experience lower back pain, buttock pain, and other aches.