17479 Small Fiber Neuropathy

Overview

Small fiber neuropathy is a condition that affects the tiny nerves in your skin, organs, and other tissues. These nerves help you feel pain, temperature, and touch. When they are damaged, you may feel burning, tingling, or numbness, often in your hands and feet. It is not life-threatening, but it can affect your quality of life.

It is not rare, but exact numbers are unknown because many cases go unrecognized or are misdiagnosed.

It can affect people of all ages, but it is more common in adults, especially those with diabetes, autoimmune conditions, or a family history of neuropathy.

Symptoms

Common symptoms

• Burning or tingling pain, often in the hands and feet
• Numbness or loss of feeling
• Sharp, stabbing, or electric-like pain
• Sensitivity to light touch, such as bedsheets
• Changes in temperature sensation – feeling too hot or too cold
• Autonomic symptoms like excessive sweating, dry eyes or mouth, dizziness when standing, or bladder changes

Symptoms in children

• Children may describe symptoms as 'pins and needles' or 'ouch' when touched.
• They may have trouble sleeping due to leg discomfort or restless legs.
• Some children may avoid walking or complain of foot pain during sports.

Symptoms in older adults

• Older adults may notice balance problems or falls due to numbness in the feet.
• Pain may be worse at night and can disturb sleep.
• They may also have less obvious symptoms like dizziness when standing, or changes in sweating and digestion.

Causes

Main causes

• Diabetes (most common cause)
• Autoimmune diseases – where the immune system attacks the body's own tissues
• Infections such as hepatitis or Lyme disease
• Vitamin deficiencies, especially B vitamins
• Exposure to certain toxins or medications
• Inherited gene changes (rare)
• Sometimes no cause is found – this is called idiopathic

Risk factors

• Having diabetes or metabolic syndrome
• Family history of neuropathy
• Autoimmune conditions like lupus or Sjögren's syndrome
• Excess alcohol use
• Kidney or liver disease
• Certain infections

When to see a doctor

See a doctor urgently if:

• If you have sudden or rapidly worsening weakness or numbness
• If you have fainting spells or a very slow or irregular heartbeat
• If you have difficulty breathing or swallowing

Book a routine appointment if:

• If you have ongoing burning, tingling, or numbness that does not improve
• If symptoms interfere with sleep, walking, or daily activities
• If you have dizziness when standing that happens often

Diagnosis

Your doctor will start by asking about your symptoms and doing a physical exam. They may check your reflexes, muscle strength, and ability to feel touch, temperature, and pinprick. If they suspect small fiber neuropathy, they may refer you to a neurologist (a nerve specialist) for more tests.

Tests that may be done

• Nerve conduction studies – measure how well your nerves send signals
• Skin biopsy – a tiny sample of skin is taken to look at the density of small nerve fibers
• Blood tests – to check for diabetes, vitamin deficiencies, thyroid problems, or autoimmune markers
• Autonomic tests – to check how your body controls sweating, heart rate, and blood pressure

What to expect at your appointment

You may see a specialist and have several tests. These are usually painless or cause only mild discomfort. It can take time to get a clear diagnosis, so try to be patient. Ask your doctor to explain each step and what you can do to help.

Treatment

There is no cure for small fiber neuropathy, but treatment aims to relieve symptoms and treat the underlying cause. For example, if diabetes is the cause, controlling blood sugar can help slow or stop nerve damage.

Self-care at home

• Check your feet daily for cuts, blisters, or sores.
• Wear well-fitting, comfortable shoes and cotton socks.
• Avoid very hot or cold temperatures – test water with your elbow.
• Quit smoking and limit alcohol.
• Use gentle skin care products to keep skin moist.
• Set up your home to prevent falls – remove rugs and keep pathways clear.

Medical treatments

Doctors may recommend medicines to ease nerve pain. These work on the nervous system and are not standard painkillers. They may also suggest prescription creams, patches, or other therapies like physical therapy, cognitive behavioral therapy, or nerve stimulation. Always talk to your doctor about the best approach for you, and ask about possible side effects.

When is surgery considered?

Surgery is not usually used for small fiber neuropathy itself. However, if an underlying condition such as a trapped nerve or a tumor is causing your symptoms, surgery may be part of the treatment plan.

Living with this condition

Try to keep a daily routine that includes gentle movement and planned rest. Pay attention to foot health, and protect against burns and injuries. If you have pain, find comfortable positions, use relaxation techniques, and pace your activities to avoid flare-ups.

Lifestyle tips

• Exercise regularly with low-impact activities like walking, swimming, or yoga.
• Manage stress through mindfulness, breathing exercises, or hobbies.
• Prioritise good sleep – keep a regular sleep schedule and make your bedroom comfortable.
• Stay connected with friends and family, and let them know how they can help.

Diet and exercise

Eat a balanced diet with plenty of fruits, vegetables, whole grains, and lean proteins. Some people find that limiting sugar, refined carbohydrates, and alcohol helps their symptoms. Staying active can improve circulation and reduce stress, but avoid overdoing it – listen to your body.

Mental health and emotional wellbeing

Living with chronic pain can be stressful and can affect your mood. It is normal to feel frustrated, sad, or anxious. Talk to your doctor if you feel overwhelmed – they can suggest counselling or resources. If you are in crisis, contact a mental health helpline or go to your local emergency department.

Prevention

You cannot always prevent small fiber neuropathy, but you can reduce your risk by managing conditions like diabetes, staying physically active, avoiding alcohol abuse, eating a healthy diet, and protecting yourself from toxins.

Vaccines

There is no vaccine for small fiber neuropathy. Vaccinations for common infections like flu and pneumonia are still recommended, because infections can sometimes trigger or worsen neuropathies.

Screening programmes

There is no routine screening for this condition, but regular check-ups with your doctor can help monitor underlying conditions like diabetes and vitamin deficiencies.

Complications

If left untreated

• Symptoms may get worse and spread further up the arms and legs.
• Numbness can lead to falls, burns, or injuries you do not feel.
• Foot sores and ulcers may develop and become infected.
• Autonomic problems may affect your heart, blood pressure, digestion, or bladder.

Long-term outlook

With the right care, many people manage their symptoms well and continue to lead active lives. The outlook depends on the underlying cause. Even if the cause is unknown, treatment and self-care can make a real difference. There is hope and support available.

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