Polyarteritis nodosa awareness

Overview

Polyarteritis nodosa (PAN) is a rare disease that causes inflammation in medium-sized blood vessels. Inflammation is when part of the body becomes swollen, hot, and often painful. When blood vessels are inflamed, they can become weak or narrow, which reduces blood flow to organs and tissues. This can affect many parts of the body, including the skin, nerves, kidneys, and digestive system.

No. Polyarteritis nodosa is very rare. It affects about 2 to 3 people per million each year.

PAN can appear at any age, but it is most often diagnosed in adults between 40 and 60 years old. It affects men and women roughly equally, though some studies suggest it may be slightly more common in men. It can affect people of all races and backgrounds.

Symptoms

Common symptoms

• Fever and feeling very tired or weak
• Unexpected weight loss
• Muscle aches and joint pain
• Skin changes, such as painful bumps, rashes, or open sores
• Nerve problems, like numbness, tingling, or burning pain in the hands or feet
• Belly pain, especially after eating
• High blood pressure

Symptoms in children

• Fever that lasts for days
• Skin rashes or painful lumps under the skin
• Belly pain and vomiting
• Pain in the arms or legs
• Joint swelling
• Signs of stroke-like symptoms, such as weakness on one side of the body or trouble speaking (this is rare but serious)

Symptoms in older adults

• More general symptoms like confusion or being very tired may be easier to miss
• Nerve pain and muscle weakness may be more common
• Older adults may have kidney problems or high blood pressure more often
• Falls or weakness in the legs can be an early sign

Causes

Main causes

• The exact cause of PAN is not understood. It is thought to be an autoimmune disease, meaning the immune system mistakenly attacks the body’s own blood vessels.
• In some people, PAN is linked to an infection with the hepatitis B virus, which affects the liver. This is not a common cause, but it is one of the few known triggers.
• PAN is not contagious, so you cannot catch it from another person.
• It is not usually passed down in families, so genetics do not play a strong role.

Risk factors

• Having a hepatitis B infection, past or active, increases the chance of developing PAN.
• Being between 40 and 60 years old.
• Some rare inherited conditions or other autoimmune diseases may make you more at risk, but this is not well understood.

When to see a doctor

See a doctor urgently if:

• If you have a fever, weight loss, and body aches that last for more than a few weeks, see a doctor.
• If you have new nerve symptoms like numbness or tingling, get medical help promptly.
• If you see blood in your urine or have very dark urine, contact a healthcare provider the same day.

Book a routine appointment if:

• If you have ongoing fatigue, muscle aches, or skin changes that are not getting better, make an appointment to discuss them.
• If you have high blood pressure that is hard to control, mention it to your doctor.
• If you have belly pain after eating and are losing weight without trying, tell your doctor.

Diagnosis

There is no single test for PAN. A doctor will take a detailed medical history, do a physical exam, and order several tests to look for signs of inflammation and organ involvement. You may be referred to a specialist, such as a rheumatologist (a doctor who treats autoimmune and joint diseases) or a specialist in blood vessel diseases.

Tests that may be done

• Blood tests to check for inflammation, anemia, kidney function, and liver function.
• Urine tests to check for blood or protein.
• A biopsy, which means taking a small piece of tissue from an affected area, such as skin or muscle, to look for inflammation in blood vessels.
• An angiogram, which uses dye and X-rays or MRI to look at blood vessels and spot areas that are narrowed or bulging.
• Nerve conduction tests to check for nerve damage.

What to expect at your appointment

Diagnosis may take time because PAN is rare and its symptoms mimic other conditions. You will likely need to see more than one specialist and have several appointments. The process can be stressful, but it is important to be patient and share all your symptoms, even ones that seem unrelated.

Treatment

Treatment for PAN aims to calm the inflammation in your blood vessels and prevent organ damage. It usually involves medicines that lower immune system activity. The exact treatment plan depends on how severe the disease is, which organs are affected, and your overall health. Treatment is typically led by a specialist team and may be needed for months or years.

Self-care at home

• Rest when you feel tired, and pace your activities to avoid overdoing it.
• Follow your treatment plan and keep all medical appointments.
• Talk to your doctor before taking any over-the-counter medicines, as some can affect blood pressure or kidneys.
• Use warm compresses and gentle skin care for skin symptoms, but ask your doctor first.
• Keep a symptom diary to track fevers, pain, or new symptoms to share with your healthcare team.

Medical treatments

Medical treatment for PAN usually includes medicines that suppress your immune system, such as corticosteroids and other disease-modifying drugs. These medicines help reduce inflammation but can have side effects, so your doctor will monitor you closely. If you have hepatitis B, your doctor will also treat that infection separately. In severe cases, you may receive treatments through an IV in a hospital. The medicines and doses are chosen specifically for you.

When is surgery considered?

Surgery is rarely needed for PAN itself. It may be considered if a blood vessel becomes severely blocked or if there is internal bleeding that cannot be controlled otherwise. Surgery is more common for complications, like repairing a bulging blood vessel, rather than for the disease itself.

Living with this condition

Living with PAN can be challenging, especially during flares. You may have unpredictable symptoms and need to adjust your daily routine. It helps to build a strong relationship with your healthcare team and to ask for support when you need it. Many people with PAN lead active lives, especially once treatment brings the disease under control.

Lifestyle tips

• Learn to manage your energy — rest when needed and gradually increase activity.
• Stay active with gentle exercise like walking or stretching, as your energy allows.
• Avoid smoking, as it damages blood vessels.
• Limit alcohol, which can affect blood pressure and liver.
• Protect your skin from cold and trauma, since skin may be more fragile.

Diet and exercise

Eating a balanced diet with plenty of fruits, vegetables, whole grains, and lean protein helps support your body. If you have high blood pressure or kidney issues, your doctor may suggest reducing salt or following a kidney-friendly diet. Light to moderate exercise can help with muscle strength, circulation, and mood. Always check with your doctor before starting a new exercise program.

Mental health and emotional wellbeing

Living with a chronic illness can bring stress, anxiety, and sadness. It is normal to feel worried about the future. Talk to your doctor if you notice low mood, hopelessness, or a loss of interest in things you used to enjoy. Mental health care, including counseling or support groups, is an important part of treatment.

Prevention

PAN itself cannot be prevented, because the cause is not fully understood. However, in some parts of the world, hepatitis B infection is a known trigger. Reducing your risk of hepatitis B — for example, by avoiding shared needles and practicing safe sex — may lower the chance of developing PAN in the future.

Vaccines

There is a vaccine for hepatitis B. If you are at higher risk for hepatitis B, talk to your doctor about getting vaccinated. This may reduce one known trigger for PAN. Other vaccines, like flu or pneumonia vaccines, are not directly related to PAN but are important to keep you healthy. Check with your doctor about what is right for you.

Screening programmes

There is no routine screening for PAN in the general population. If you have symptoms that suggest vasculitis, your doctor will order specific tests. People with hepatitis B are not routinely screened for PAN, but they should tell their doctor about any unusual symptoms.

Complications

If left untreated

• Damage to nerves, leading to weakness or loss of feeling
• Kidney damage, including kidney failure that may require dialysis
• High blood pressure that is difficult to control
• Stroke caused by a blocked or bleeding blood vessel in the brain
• Bowel damage, which can cause severe belly pain, bleeding, or a hole in the intestine
• Heart attack or heart failure

Long-term outlook

With treatment, the outlook for PAN has greatly improved. Many people enter remission, which means the disease becomes quiet and symptoms go away. Treatment can help prevent further organ damage and improve quality of life. Some people may need long-term treatment, and flare-ups can happen, but most who receive care can manage the condition and live meaningful lives.

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