# Symptoms and Stages of Primary Immunodeficiencies
Primary immunodeficiencies (PID) form a diverse group of disorders, and their course varies greatly depending on the type and the individual. This tab describes how these diseases typically manifest, what symptoms may occur in different stages, and what is known about them at the population level.
Early stage: symptoms before diagnosis
In the early stage — often in childhood, but sometimes only later in life — the first signals emerge. This stage lasts until diagnosis, which can be weeks to years.
**Most common symptoms: **
- **Recurrent infections**: this is the most important warning sign. Respiratory tract infections (sinuses, lungs, ears) occur much more frequently than usual, sometimes 6 to 12 times or more per year, and recover more slowly or not completely.
- **Infections that are severe or unusual**: bacterial pneumonia, meningitis, sepsis, or infections with unusual bacteria (such as certain atypical or fungal species) that rarely occur in healthy people.
- **Chronic or recurrent diarrhea**: in some types of PID (such as certain forms of common variable immunodeficiency, CVID) gastrointestinal complaints can persist for years before diagnosis.
- **Growth and developmental disorders**: especially in severe forms, children may not grow or develop well.
- **Enlarged lymph nodes or spleen**: sometimes lymph nodes are enlarged as the body attempts to fight infections, or conversely absent if certain cells are not formed properly.
- **Rash or skin infections**: recurring skin infections, inflammation or unusual rashes.
- **Joint complaints or inflammation**: some PID types are accompanied by autoimmune phenomena.
**Meaning for daily life:**
Parents or patients notice that hospital visits, dentists, schools and social activities are continually interrupted by infections. Children may fall behind in growth, school or social development. The uncertainty — not knowing what is wrong — leads to stress and frequent visits to different doctors.
**When doctors become alert:**
Pediatricians and general practitioners pay attention to the pattern: are there many more infections than average, are they more severe, or is the child not recovering well? In some types of PID, a first more serious infection (meningitis, sepsis) becomes the reason for investigation. In adults, an incidentally discovered abnormality in blood values (for example, low immunoglobulin levels) may be the starting point.
Stage of diagnostic workup
This stage can last weeks to months. Blood tests (immunoglobulin levels, counts of different white blood cells, genetic tests) and possibly bone marrow or tissue biopsies are performed. This is not a disease stage in itself, but a crucial moment of uncertainty.
Stage without treatment (depending on type)
For very severe forms (such as certain forms of combined immunodeficiency) this stage can be very short — infections escalate rapidly and become life-threatening.
For less acute forms (such as certain CVID types) patients may remain without treatment for years, although symptoms persist.
**Symptoms depend heavily on the specific PID type:**
- **Respiratory tract infections**: sinusitis, bronchitis, pneumonia; can sometimes last for months.
- **Food poisoning or intestinal infections**: can become chronic; some patients have diarrhea for months.
- **Chronic inflammation**: some PID types are accompanied by autoimmune or granulomatous inflammation (for example, in lungs or gastrointestinal tract), which presents as chronic cough, abdominal pain or diarrhea.
- **Infections with opportunistic pathogens**: in the most severe forms, rare infections (certain fungi, viruses) can occur that usually only occur in severe HIV or after chemotherapy.
**Meaning for daily life:**
Working adults must be constantly absent. Children miss school. Energy levels drop due to ongoing infection or chronic inflammation. Fear of serious infections hangs over many families. Nutrition can become problematic with chronic gastrointestinal complaints.
Phase under treatment (supportive therapy and infection prevention)
Once diagnosed, treatment is initiated. The most common treatment for many PID types is replacement therapy with immunoglobulins (antibodies), usually as intravenous (iv) infusion or subcutaneous injection. These are administered approximately every 3 to 4 weeks. Other treatments consist of prophylaxis (prevention) of certain infections, or in newer cases also stem cell therapy or gene therapy.
**Changes in symptoms:**
- **Decrease in infection frequency**: with regular immunoglobulin administration, infections usually decrease; many patients go from monthly 4-6 infections back to 1-2 per year.
- **Infections become milder**: when they occur, they usually heal faster and without complications.
- **Chronic complaints**: gastrointestinal symptoms or chronic cough may improve slowly, but do not always disappear completely.
- **Side effects of treatment**: infusion reactions (fever, headache, chills) with iv immunoglobulin occur in approximately 5-10% of infusions, especially at the beginning. Skin reactions to subcutaneous injections are also possible (redness, pain).
- **Quality of life improves**: many patients report more energy, fewer hospital visits and better school or work performance.
**Figures about this phase: **
For patients under immunoglobulin treatment, the number of serious infections (length of hospitalization and type) decreases significantly. Exact survival rates depend heavily on the PID type and how quickly treatment is initiated. For many CVID patients under regular replacement, median survival is normal to close to normal life expectancy, provided treatment is continued — data from cohorts from 2010-2020 show this, although individual outcomes vary greatly depending on what complications develop (lung fibrosis, lymphoma risk, autoimmune diseases).
It is crucial to understand that this survival is entirely dependent on ongoing treatment. Without immunoglobulin administration, infections quickly increase again.
Phase with complications
As patients live longer, complications specific to certain PID types may develop.
**Common complications:**
- **Granulomatous lung disease**: a chronic inflammation in the lungs that presents as chronic cough, shortness of breath and fatigue. This occurs in types such as CVID (up to 5-10% of patients over their lifetime).
- **Gastrointestinal inflammation or chronic diarrhea**: also in CVID; some patients have diarrhea for years despite immunoglobulin treatment.
- **Liver disease**: some PID types carry increased risk of viral hepatitis.
- **Lymphoproliferative complications**: certain PID types, especially those with immune disorders, have increased risk of certain types of lymphoma or benign lymphoid growth.
- **Autoimmune diseases**: paradoxically, some PID patients also develop autoimmune disease (e.g. rheumatoid arthritis, hemolytic anemia).
- **Infections despite treatment**: some infections (certain bacteria, viruses) may return despite proper treatment; this may signal a change in the disease pattern.
**Meaning for daily life:**
Prolonged fatigue, shortness of breath, and ongoing medical check-ups become part of life. Work or school may be further limited. The psychological impact of chronic illness and the need for monthly infusions can be considerable.
**Figures on complications:**
In CVID, approximately 5-15% of patients develop granulomatous inflammation in the lungs during their lifetime (source: international CVID registries 2015-2025). The risk of lymphoma is increased, but varies greatly by type (from a few percent to 20% lifetime risk, depending on the specific genetic type). Autoimmune cytopenias (anaemia, thrombocytopenia) occur in approximately 10-30% of CVID patients at some point in their lives.
Again: these are population figures that say nothing about an individual patient. Many people have few complications for years.
Phase with gene therapy or stem cell therapy (where applied)
For certain, usually severe PID types (e.g. certain forms of SCID — severe combined immunodeficiency — or certain genetic defects), stem cell therapy (bone marrow transplantation) or gene therapy is available. These are curative approaches that are not available in all centres.
**Symptoms during and after transplantation:**
- **Initial period (induction)**: chemotherapy to disable bone marrow, which greatly increases infection risk, nausea, hair loss.
- **Periods**: decrease in infections as the new immune system recovers (this takes months to years).
- **Side effects of graft-versus-host disease**: the donor immune system can attack host tissue, causing inflammation in the skin, gastrointestinal tract and other organs.
- **Long-term complications**: even successfully transplanted patients can suffer from infection susceptibility or immune imbalance for years.
**Numbers:**
For very severe SCID with stem cell therapy, survival without recurrent infections is approximately 70-90% after 5 years, depending on donor type and type of SCID (data from transplant centres 2015-2024). For gene therapy (newer), longer-term data are still limited. These are limited availability treatments in specialised centres.
When to contact your doctor
Patients or their families should be alert to signs that warrant faster medical attention:
- **Infections that increase** in frequency or severity despite treatment — this may indicate that something has changed (new infectious agent, change in immunoglobulin absorption).
- **New severe symptoms**: sudden fever above 39 °C, severe shortness of breath, severe abdominal pain, or other unusual symptoms.
- **Side effects of infusions that worsen**: increasing fainting, severe skin reactions, or allergy-like symptoms.
- **Chronic progression**: persistent increase in cough, diarrhoea, or fatigue despite treatment.
- **Planned operations or dental treatments**: these require preparation.
The treating physician can then determine whether adjustments are needed, or whether underlying complications need to be investigated.
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_This information never replaces a doctor's judgment. Always discuss your situation with your own healthcare provider._