Chronic inflammatory demyelinating polyneuropathy

Overview

Chronic inflammatory demyelinating polyneuropathy (say: po-lee-nye-ROP-uh-thee), or CIDP, is a long-term condition where the body's immune system mistakenly attacks the protective covering (called myelin) around your nerves. This damages the nerves and causes weakness, numbness, and other problems, especially in the arms and legs.

No, CIDP is rare. It affects about 1 to 9 out of every 100,000 people worldwide.

CIDP can affect people of any age, but it is most often diagnosed in adults between 40 and 60 years old. Men are slightly more likely to develop it than women.

Symptoms

Common symptoms

• Gradual weakness in both arms and legs that gets worse over time
• Tingling, numbness, or a pins-and-needles feeling in the hands and feet
• Loss of balance or trouble walking, like tripping more often
• Difficulty with fine motor skills, like buttoning a shirt or writing
• Tiredness (fatigue) and muscle aches
• Deep pain in the arms or legs

Symptoms in children

• In children, CIDP can cause weakness or clumsiness that may be mistaken for growing pains.
• They may have trouble climbing stairs, running, or keeping up with friends.
• Sensory symptoms like numbness or tingling are less common than in adults.

Symptoms in older adults

• Older adults may experience more severe weakness, which can lead to falls.
• They are more likely to have other health conditions that can make diagnosis trickier.
• Recovery may take longer, but treatment can still help.

Causes

Main causes

• The exact cause of CIDP is unknown. It is an autoimmune condition, meaning the immune system attacks the myelin covering of your nerves.
• It is not contagious and cannot be passed from person to person.

Risk factors

• Having certain autoimmune diseases, like lupus or diabetes
• A history of an infection or surgery may trigger CIDP in some people
• Rarely, it can run in families, but most cases happen without a family history

When to see a doctor

See a doctor urgently if:

• If you have sudden or rapidly worsening weakness, especially if it affects your breathing or swallowing, seek emergency care immediately.

Book a routine appointment if:

• If you notice gradual weakness, numbness, or tingling in your arms or legs that lasts more than a few weeks, make an appointment with your GP or a neurologist (nerve doctor).

Diagnosis

Diagnosis is based on your symptoms, a physical exam, and tests that check how well your nerves are working. A neurologist will usually make the final diagnosis.

Tests that may be done

• Nerve conduction studies — small electrodes are placed on your skin to measure how fast electrical signals travel along your nerves.
• Electromyography (EMG) — a thin needle is inserted into muscles to check their electrical activity.
• Lumbar puncture (spinal tap) — a sample of fluid from your spine is tested for high protein levels, which is common in CIDP.
• Blood tests — to rule out other conditions that can cause similar symptoms.
• Nerve biopsy (rarely) — a small piece of nerve is taken to look at under a microscope.

What to expect at your appointment

Diagnosing CIDP can take time because it is rare and has symptoms similar to other nerve problems. Your doctor will likely refer you to a specialist. Tests are usually done as an outpatient, and you can go home the same day.

Treatment

Treatment for CIDP aims to calm the immune system and help your nerves recover. Many people get better with treatment, but it may take months. Some people need long-term therapy.

Self-care at home

• Work with a physiotherapist to keep your muscles strong and improve balance.
• Use handrails, walking aids, or other supports to prevent falls.
• Talk to an occupational therapist about ways to make daily tasks easier, like using special tools for dressing or cooking.
• Protect your hands and feet from injury by checking for cuts or burns, as numbness can make you unaware of them.

Medical treatments

Medical treatment usually involves medications that suppress the immune system, such as corticosteroids or other immunosuppressants. Another option is intravenous immunoglobulin (IVIG), which is given through a drip into a vein. Plasma exchange (plasmapheresis) is also used — a machine filters harmful antibodies from your blood. These treatments are given under the supervision of a specialist. Your doctor will discuss the best option for you based on your health and preferences.

When is surgery considered?

Surgery is not a treatment for CIDP itself. However, if you develop problems like nerve compression or contractures (tight joints), surgery may be considered in rare cases.

Living with this condition

Living with CIDP can be challenging, but many people adapt and maintain a good quality of life. It helps to pace yourself, rest when needed, and ask for help with tasks that are hard to do.

Lifestyle tips

• Set a daily routine that includes rest periods and gentle activity.
• Use assistive devices like braces, walkers, or wheelchairs if needed.
• Keep your home safe — remove rugs, add grab bars, and improve lighting.
• Talk to your employer about adjustments if your job involves physical activity.

Diet and exercise

Eat a balanced diet with plenty of fruits, vegetables, and protein to support nerve health. Gentle exercises like walking, swimming, or stretching can help maintain muscle strength and flexibility. Always check with your doctor or physiotherapist before starting a new exercise program.

Mental health and emotional wellbeing

Living with a chronic condition can be stressful and may lead to feelings of anxiety or depression. It's important to talk to your healthcare team about your mental health. Consider joining a support group or talking to a counsellor who understands long-term illness. If you are having thoughts of self-harm, contact emergency services or a crisis line immediately.

Prevention

There is no known way to prevent CIDP because the cause is not fully understood.

Complications

If left untreated

• Permanent nerve damage and muscle weakness
• Difficulty walking or using your hands
• Breathing problems if the nerves to your diaphragm (the muscle that helps you breathe) are affected
• Pressure sores or injuries from numbness
• Depression and social isolation

Long-term outlook

With early diagnosis and appropriate treatment, most people with CIDP experience significant improvement, though some may have lingering weakness. The condition can relapse (flare up) and remit (get better), so ongoing care is important. Many people continue with work, hobbies, and a full life. Your doctor will work with you to find the best treatment plan and adjust it over time.

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