7 Common Disorders of the Immune System

Your immune system works hard every day, keeping you safe from infections, viruses and harmful bacteria. It’s a complex network of cells, tissues and organs that recognises threats and helps your body fight them off. But sometimes the system doesn’t work as it should. Disorders of the immune system can leave you vulnerable to illness or, in some cases, cause your body to attack itself.

In this guide, we explore seven common immune system disorders, what you might notice if you have one and how understanding your immune health can help you take action.

How the immune system can become disrupted?

The immune system is designed to protect you, but sometimes it becomes underactive, overactive or confused. Here are seven common disorders that can affect how well it works.

1. Primary Immunodeficiency Disorders

Primary immunodeficiency disorders (PIDs) are caused by inherited problems in the immune system. People with these disorders are born with an immune system that doesn’t function properly, leaving them more susceptible to infections.

Symptoms can vary depending on the type of PID, but common signs include:

• Frequent infections such as sinusitis, ear infections or pneumonia

• Poor response to standard treatments like antibiotics

• Delayed growth in children

While rare, PIDs are serious and often require specialist care. Identifying a primary immunodeficiency early can help manage infections and improve quality of life.

2. Secondary immunodeficiency

Unlike primary disorders, secondary immunodeficiencies are acquired later in life. They can result from illnesses, medications or lifestyle factors that weaken the immune system.

Common causes include:

• Chronic illnesses such as diabetes or kidney disease

• Certain cancers and cancer treatments

• Long-term use of immunosuppressant drugs

Symptoms usually appear as repeated infections or slow recovery times. A private immune system test can provide insights into whether your immune function is being affected by secondary causes and help guide preventive strategies.

3. Autoimmune disorders

Autoimmune disorders occur when the immune system mistakenly attacks healthy cells and tissues. These conditions can affect almost any part of the body and often cause chronic inflammation.

Some of the more common autoimmune disorders include:

• Rheumatoid arthritis, which affects the joints

• Type 1 diabetes, which targets the pancreas

• Multiple sclerosis, which affects the nervous system

• Lupus, which can impact skin, joints and organs

Symptoms often come and go and can include fatigue, pain, swelling or unexplained rashes. Detecting autoimmune activity early can make a significant difference in managing symptoms and maintaining health.

4. Allergies

Allergies happen when the immune system overreacts to harmless substances, such as pollen, pet dander or certain foods. While often considered minor, allergies can sometimes be severe and even life threatening.

Signs of an allergic reaction include:

• Sneezing, runny nose or watery eyes

• Skin reactions such as hives or eczema

• Digestive issues such as nausea, vomiting or diarrhoea

• In extreme cases, anaphylaxis

Managing allergies often involves avoiding triggers, taking medication or receiving immunotherapy. Knowing your immune system’s sensitivity can help you make informed decisions about your environment and lifestyle.

5. Chronic infections

A weakened immune system can make you more susceptible to infections that persist or recur. Chronic infections can occur due to bacterial, viral or fungal causes.

Examples include:

• Recurrent sinus or chest infections

• Chronic urinary tract infections

• Persistent viral infections like herpes or hepatitis

People with chronic infections may experience fatigue, fever and slow healing. Understanding your immune system’s strengths and weaknesses can help your healthcare provider create a tailored plan to prevent or manage these infections.

6. Immunoproliferative disorders

Immunoproliferative disorders involve abnormal growth of immune cells. Some of these conditions can increase the risk of cancers such as lymphoma or leukaemia.

Signs to watch for include:

• Swollen lymph nodes

• Unexplained weight loss

• Night sweats or persistent fatigue

Early detection and monitoring are key, so regular health checks and targeted immune testing can provide valuable information about your immune system function.

7. Immune system dysregulation

Sometimes the immune system functions, but in an unbalanced way. Dysregulation can increase susceptibility to infection, inflammation or autoimmune responses.

Conditions linked to immune dysregulation include:

• Chronic fatigue syndrome

• Post-viral syndromes

• Some inflammatory disorders

Symptoms can be subtle and vary widely, so comprehensive testing can help identify underlying issues before they become serious.

Supporting your immune health

Alongside testing, there are practical steps to support your immune system:

• Maintain a balanced diet rich in fruits, vegetables, whole grains and healthy fats

• Stay active with regular exercise

• Manage stress through mindfulness or relaxation techniques

• Get adequate sleep to support immune repair and recovery

• Avoid smoking and limit alcohol intake

Even small changes can make a big difference in how well your immune system performs, particularly as we age or face recurring infections.

FAQs

What are the early signs of an immune disorder? Early signs include frequent infections, slow healing, fatigue, persistent inflammation or unusual reactions to common allergens.

Can lifestyle changes improve my immune system? Yes. Diet, exercise, sleep and stress management all play an important role in supporting immune function alongside any medical interventions.

Is a private immune system test accurate? Private tests are highly accurate and provide a snapshot of your immune system, helping guide personalised health decisions.

Who should consider an immune system test? Anyone experiencing recurrent infections, unexplained fatigue, or symptoms linked to autoimmune or immune-related conditions may benefit.

Understanding your immune health

If you're concerned about your immune system or simply want a clearer picture as part of your wider health check, our private immune system test can offer valuable insights and reassurance. It measures key markers linked to immune function, helping you understand whether your body may be more vulnerable to infections, inflammation or immune-related conditions.

This test can be added to any of our health MOT packages and is available UK-wide, making it easy to choose a location that works for you. Your sample is analysed by fully accredited UK laboratories, with fast, accurate results delivered straight to you.

BOOK NOW

Need help? Call free on 0800 652 2183 to speak to one of our team.