numbness specialist tests overview

Overview

Numbness is a loss of feeling or sensation in a part of your body. It can feel like pins and needles, or like the area has 'fallen asleep.' Specialist tests help doctors find what is causing the numbness, such as nerve problems, circulation issues, or other conditions.

Yes, numbness is very common. Almost everyone experiences temporary numbness, like when your arm 'falls asleep' after lying on it. But persistent or unexplained numbness affects many people and can be a sign of an underlying condition.

Numbness can affect anyone, but it is more common in older adults, people with diabetes, those who do repetitive motions (like typing), and individuals with nerve compression conditions. It can also occur after injuries or with certain medical conditions.

Symptoms

Common symptoms

• Loss of feeling or sensation in a specific area (e.g., hand, foot, face)
• Tingling or 'pins and needles' sensation
• Weakness in the affected area
• Burning or prickling feeling
• Sensitivity to touch or temperature changes

Symptoms in children

• Children may complain of tingling or not being able to feel their fingers or toes
• Weakness in a limb that makes it difficult to play or write
• Clumsiness or dropping objects often

Symptoms in older adults

• Numbness in the feet or legs due to poor circulation or nerve damage (neuropathy)
• Balance problems or difficulty walking
• Increased risk of falls because of reduced sensation

Causes

Main causes

• Pressure on a nerve (e.g., carpal tunnel syndrome, sciatica, or from sitting in one position too long)
• Poor blood flow (peripheral artery disease)
• Diabetes (diabetic neuropathy)
• Vitamin deficiencies (like vitamin B12)
• Injury or trauma to a nerve
• Multiple sclerosis or other autoimmune conditions
• Stroke or transient ischemic attack (TIA)

Risk factors

• Diabetes
• Repetitive hand or wrist motions
• Obesity
• Smoking
• Heavy alcohol use
• Family history of nerve problems
• Vitamin B12 deficiency (common in older adults and vegetarians)

When to see a doctor

See a doctor urgently if:

• Sudden numbness on one side of the body (possible stroke)
• Numbness after a head or spine injury
• Numbness with chest pain, difficulty breathing, or severe dizziness

Book a routine appointment if:

• Numbness that lasts more than a few days
• Tingling or numbness that interferes with daily activities
• Numbness in the feet that makes walking difficult
• Numbness with pain, redness, or swelling in the area

Diagnosis

Your doctor will first ask about your symptoms, medical history, and any recent injuries. They will examine you, checking muscle strength, reflexes, and sensation. Based on this, they may run tests to find the cause.

Tests that may be done

• Blood tests (to check for diabetes, vitamin deficiencies, or autoimmune disorders)
• Nerve conduction studies (NCS) — small shocks measure how fast nerves send signals
• Electromyography (EMG) — a thin needle electrode checks muscle electrical activity
• Magnetic resonance imaging (MRI) — detailed images to see nerves, spine, or brain
• CT scan — sometimes used if stroke or bleeding is suspected
• Ultrasound — to examine blood flow or nerve compression (like in carpal tunnel)

What to expect at your appointment

Tests are usually painless or cause mild discomfort (like a small shock during NCS). You may feel a brief prick from needles in EMG. Most tests are done in a clinic or hospital and you can go home the same day. Your doctor will explain results and next steps.

Treatment

Treatment for numbness depends entirely on the underlying cause. The goal is to address why the numbness is happening, relieve discomfort, and prevent it from getting worse. Your doctor will work with you to create a personal plan.

Self-care at home

• Rest the affected area and avoid repetitive movements that trigger numbness
• Apply heat or cold packs for comfort (10-15 minutes at a time)
• Do gentle stretches or exercises as recommended by a physical therapist
• Wear supportive braces or splints if advised (e.g., for carpal tunnel)
• Keep blood sugar under control if you have diabetes

Medical treatments

Depending on the cause, medical treatments may include physical therapy to strengthen muscles and improve nerve function, prescription medications to relieve nerve pain (not specific drugs), vitamin supplements if a deficiency is found, or medicines to improve circulation. Always follow your doctor’s advice on any treatment.

When is surgery considered?

Surgery is rarely needed, but may be considered if a nerve is compressed and other treatments haven’t helped. For example, carpal tunnel release surgery can relieve numbness in the hand. Your doctor will discuss if surgery is an option for your situation.

Living with this condition

Living with numbness means taking care to avoid injuries in the affected area. For example, if your feet are numb, check your shoes for pebbles and wear protective footwear. If your hands are numb, use caution with hot objects and sharp tools. Adapt your daily routine to reduce strain on nerves.

Lifestyle tips

• Avoid prolonged sitting or standing in one position — take breaks to move
• Maintain a healthy weight to reduce pressure on nerves and joints
• Quit smoking, as it worsens circulation and nerve health
• Limit alcohol, which can damage nerves over time

Diet and exercise

Eat a balanced diet rich in B vitamins (like whole grains, lean meats, leafy greens) and omega-3s (fish, nuts). Regular, gentle exercise such as walking, swimming, or yoga can improve circulation and nerve health. Always check with your doctor before starting a new exercise routine.

Mental health and emotional wellbeing

Chronic numbness can be frustrating and worrying. It may affect your mood, sleep, or confidence. It’s normal to feel anxious or down. Talking to a counsellor or joining a support group can help. Your doctor can also refer you to mental health services if needed.

Prevention

Some causes of numbness can be prevented. For example, managing diabetes, maintaining a healthy weight, avoiding repetitive strain, and protecting yourself from injury can reduce your risk. Eating well and staying active also help keep nerves healthy.

Vaccines

Vaccines are not used to prevent numbness directly. However, staying up to date on vaccines like shingles vaccine can reduce the risk of shingles, which sometimes causes nerve pain and numbness.

Screening programmes

Routine health checks for conditions like diabetes and vitamin deficiencies can help catch problems early. If you have risk factors, talk to your doctor about appropriate screening.

Complications

If left untreated

• Permanent nerve damage and loss of function in the affected area
• Chronic pain or painful nerve sensations (neuropathy)
• Increased risk of falls due to balance problems
• Skin injuries or infections from not feeling cuts or blisters

Long-term outlook

The outlook for numbness is often good, especially when the cause is found early. Many people experience full recovery with treatment or lifestyle changes. For chronic conditions like diabetic neuropathy, symptoms can often be managed well, allowing you to maintain a good quality of life.

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