Immunocompromised

Overview

Being immunocompromised means your immune system is weaker than usual. Your immune system is your body's defense system against germs. When it is weak, infections can happen more easily, last longer, or be more serious. Being immunocompromised is not one disease. It can be temporary, such as during some cancer treatments, or long-term, such as with some inherited immune problems.

Many people live with a weakened immune system. It is more common than many people realize because it can be temporary or long-term and can affect people of all ages.

It can affect anyone. It is more likely in people with certain health conditions, people having certain medical treatments, people who have had an organ or bone marrow transplant, and some older adults. Some people are born with immune system problems.

Symptoms

Common symptoms

• Being immunocompromised does not always cause symptoms. Symptoms usually come from infections.
• Infections that happen more often than usual or keep coming back
• Infections that are more severe, last longer, or need extra treatment
• Fever, chills, or feeling very tired with an infection
• Slow-healing cuts, sores, or wounds
• Frequent chest, sinus, urine, or skin infections
• Diarrhea that keeps coming back
• Poor appetite or weight loss with repeated infections

Symptoms in children

• Children may have more colds, ear infections, chest infections, or stomach bugs than usual
• Infections that take longer to clear or need repeated courses of treatment
• Frequent fevers or feeling very tired
• Poor growth or slow weight gain
• Many children get infections often and are not immunocompromised. Ask your doctor if you are worried.

Symptoms in older adults

• Infections may show up as confusion, falls, or weakness rather than a high fever
• Recovery from infections may be slower
• Dehydration can happen quickly with vomiting or diarrhea
• Chest and urine infections may be more serious, so seek advice early

Causes

Main causes

• Health conditions such as cancer, untreated HIV, some autoimmune diseases, kidney disease, liver disease, lung disease, or diabetes can raise infection risk
• Treatments that suppress the immune system, such as chemotherapy, radiation, steroid medicines, transplant medicines, or biologic medicines
• Having an organ or bone marrow transplant
• Removal of the spleen
• Rare inherited immune system problems
• Severe malnutrition, severe burns, or major surgery
• Some medical devices, such as catheters or ports, can make infection easier

Risk factors

• Being very young or older
• Smoking
• Heavy alcohol use
• Poor sleep or poor nutrition
• Close contact with people who are sick
• Crowded living settings
• Not being up to date with recommended vaccines
• Long-term use of medicines that affect the immune system
• Having a chronic condition that is not well controlled

When to see a doctor

See a doctor urgently if:

• You have a fever or signs of infection and your immune system is weak
• An infection is getting worse, spreading, or not improving
• You have vomiting or diarrhea and cannot keep fluids down
• You have a new cough, trouble breathing, or chest pain
• A cut, sore, or wound is red, hot, swollen, or leaking pus

Book a routine appointment if:

• You want to review your vaccines and infection prevention plan
• You are starting a medicine or treatment that can affect your immune system
• You are planning travel
• You have had repeated or unusual infections
• You need help coordinating care between your doctors

Diagnosis

Your doctor will ask about your health conditions, past infections, medicines, family history, and lifestyle. They may arrange blood tests to check immune cells and antibodies, and tests to look for infection. The diagnosis is based on the whole picture, not one test alone.

Tests that may be done

• Blood counts to check white cells and other blood cells
• Antibody level tests
• Tests of how well immune cells work
• Tests for infections when you have symptoms
• HIV testing when appropriate
• Imaging such as a chest X-ray if you have chest symptoms
• A review of all medicines, including over-the-counter and herbal products

What to expect at your appointment

Some tests take days or weeks to come back. You may be referred to a specialist in immunology or to the team managing your underlying condition. Keep a list of infections, dates, and medicines to help your doctor understand your pattern.

Treatment

The goal is to treat any underlying cause when possible, lower your risk of infection, and treat infections quickly. Your plan will be personal to you and may change over time.

Self-care at home

• Wash your hands often with soap and water
• Avoid close contact with people who are clearly unwell
• Follow food safety advice, such as cooking meat well and washing produce
• Avoid unpasteurized dairy foods and untreated water
• Wear gloves for gardening and clean up after pets safely
• Keep cuts and grazes clean and covered
• Do not smoke, and limit alcohol
• Get enough sleep and stay active
• Tell every healthcare provider that you are immunocompromised
• Call your care team early if you think you have an infection

Medical treatments

Treatment depends on the cause. It may include treating the underlying condition, adjusting medicines that suppress the immune system only with your specialist, preventing infections, and treating infections promptly with medicines prescribed by your team. Some people need extra immune support or preventive medicines. Your team will decide what is safe and suitable for you.

When is surgery considered?

Surgery is not a treatment for being immunocompromised itself. Surgery may be needed for related problems, such as treating an infection or removing an infected device. Transplant surgery is a specialized treatment for some organ failure, not a general fix for a weak immune system.

Living with this condition

Keep a simple health file with your conditions, medicines, allergies, and care team contacts. Tell your dentist and all doctors that you are immunocompromised. Ask your team what to do if you get a fever, and keep that plan where you can find it. When your immune system is very weak, you may need to avoid crowded places for a while.

Lifestyle tips

• Stay up to date with vaccines your team recommends
• Ask about travel health before you book a trip
• Do not share razors, toothbrushes, or towels
• Keep your home clean and store food safely
• Wear gloves for gardening or handling pet waste
• Ask someone else to clean bird cages, cat litter, or fish tanks if possible
• Manage stress and keep regular sleep routines

Diet and exercise

Eat a balanced diet with plenty of fruits, vegetables, protein, and whole grains. Be extra careful with food safety. Moderate activity, such as walking or gentle strength exercises, helps your body and mood. Ask your team about any special diet or exercise limits.

Mental health and emotional wellbeing

Living with a weak immune system can feel worrying, isolating, or frustrating. It is normal to have those feelings. Talk to your care team if you feel low or anxious. If you have thoughts of harming yourself, contact local crisis support or emergency services right away.

Prevention

You cannot always prevent being immunocompromised, but you can lower your risk of infections. Good hygiene, safe food, vaccines, and quick treatment of infections are key.

Vaccines

Vaccines are an important part of your plan. Some vaccines may not be safe if your immune system is very weak, so always ask your healthcare team first. People you live with may also need vaccines to help protect you.

Screening programmes

Regular check-ups help your team spot problems early. Depending on your age and health, you may need routine cancer screening, dental checks, and tests for infections. Ask your team what is right for you.

Complications

If left untreated

• Infections that are more frequent, more severe, or last longer
• Hospital stays and slower recovery
• Damage to organs from severe infection
• Some immune problems raise the risk of certain cancers
• Untreated underlying conditions, such as HIV, can become more serious

Long-term outlook

Many people with a weakened immune system live full and active lives with good planning and care. Some immune problems are temporary, and others are long-term. Early treatment, prevention, and a strong relationship with your care team make a real difference.

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