Several medical conditions, including diabetes, frostbite, Lyme disease, Morton's neuroma, multiple sclerosis, sciatica and spinal cord injuries, can cause numbness in the feet, according to Healthline. It is also possible to experience numbness in the foot after sitting for too long in the same position. It is important to contact a doctor if there is no reasonable explanation for the numbness or if other symptoms accompany the numbness.
Symptoms that may accompany numbness in the foot include confusion, difficulty breathing or talking, dizziness, headache, and loss of bladder or bowel control. When numbness in the foot occurs alongside these symptoms, it can signify more severe medical conditions, such as seizures, strokes and transient ischemic attacks, according to Healthline. Doctors can diagnose the causes of foot numbness through physical examinations and nerve conduction studies.
Diabetes often leads to numbness in the foot because blood sugar levels and decreased blood flow can lead to nerve damage. The condition is a metabolic disorder that needs to be regulated consistently to prevent any nerve damage, as Healthline explains. Another serious disorder that leads to numbness in the feet and other body parts is multiple sclerosis, which causes damage to the area surrounding nerve cells.