Periodic fever syndromes, encompassing a spectrum of autoinflammatory disorders, trigger recurrent bouts of fever and inflammation affecting various organs. Although these syndromes have no predilection for gender or ethnicity, their rarity and genetic nature pose significant challenges in diagnosis and management.

Understanding Periodic Fever Syndromes

Periodic fever syndromes are a collection of conditions characterised by recurrent episodes of fever and inflammation. Infections or autoimmune disorders do not trigger these episodes but these occur due to unregulated inflammatory processes. The syndromes generally fall under the category of autoinflammatory diseases. Here we detail some of the most prevalent types:

PFAPA Syndrome Stands for Periodic Fever, Aphthous Stomatitis, Pharyngitis, and Adenitis. It is common in early childhood, and symptoms include recurrent fever, mouth sores, sore throat, and swollen lymph nodes. Episodes occur at regular intervals without long-term complications.
Familial Mediterranean Fever (FMF) is a genetic disorder predominantly affecting individuals of Mediterranean and Middle Eastern descent. Symptoms involve recurrent fever, abdominal, chest, or joint pain, and swelling. Untreated FMF may lead to amyloidosis, a buildup of proteins that causes organ failure.
Tumour Necrosis Factor Receptor-Associated Periodic Syndrome (TRAPS): Causes intermittent fevers, painful rash, chills and muscle pain. It can manifest in childhood or be delayed until adulthood. It presents unique eye symptoms such as conjunctivitis and periorbital swelling.
Hyperimmunoglobulin D Syndrome (HIDS): This is a rare genetic condition wherein episodes of high fever, skin rash, abdominal pain, vomiting, diarrhoea, joint pain, and swollen neck glands.

Symptoms and Diagnosis

Individuals with periodic fever syndromes typically experience a constellation of symptoms that recur with a predictable pattern. These symptoms often include:

Recurrent Fevers: These fevers usually last for the same duration during each episode and are a hallmark of the syndrome.
Consistent Accompanying Symptoms: Along with fever, patients may experience a rash, joint pain and swelling, sores in the mouth, and abdominal pain.
Headache and diarrhoea: These symptoms may also be present during episodes, adding to the patient's discomfort.

The process of diagnosing periodic fever syndromes is multifaceted and includes:

Physical Examination and Medical History Review: Physicians will conduct a thorough physical examination and review the patient's family medical history, looking for patterns that suggest a periodic fever syndrome.
Laboratory Tests: Blood tests are performed to detect signs of inflammation accompanying the fevers. These tests can include markers such as erythrocyte sedimentation rate (ESR) and C-reactive protein (CRP).
Genetic Testing: Genetic testing is often utilised to identify specific genetic mutations associated with periodic fever syndromes, particularly when there is a suspicion of syndromes like Familial Mediterranean Fever or TRAPS.

Causes and Risk Factors

Periodic fever syndromes are primarily attributed to hereditary factors, with many cases arising from genetic mutations inherited from one's parents. These mutations can alter the normal function of the immune system, leading to the unregulated inflammation characteristic of these syndromes. The following points elaborate on the genetic basis of periodic fever syndromes:

Hereditary Nature: The tendency to develop periodic fever syndrome can be passed down through families, indicating a strong genetic component to the disease.
Genetic Mutations: Specific mutations in genes that regulate the immune system's inflammatory response are often responsible for the onset of periodic fever syndromes. These mutations can lead to an overactive immune response, even without external threats like infections.
Inheritance Patterns: The inheritance pattern may vary among the different types of periodic fever syndromes. Some are inherited in an autosomal dominant manner, meaning only one copy of the mutated gene from either parent can cause the syndrome. Others follow an autosomal recessive pattern, requiring two copies of the mutated gene, one from each parent, for the syndrome to manifest.

Treatment Options and Management

While periodic fever syndromes currently have no cure, many treatment options exist to manage symptoms and improve patient quality of life. These treatments, prescribed by a rheumatologist, are tailored to the specific diagnosis and the individual's symptom severity. Below is an overview of the management strategies for these syndromes:

General Management:

Anti-inflammatory medications are commonly prescribed to prevent symptoms.
Long-term treatment may be necessary for some, while others may see resolution as the child grows.
Support from specialised departments, such as Medical & Molecular Genetics and Rheumatology, is essential for comprehensive care.

Syndrome-Specific Treatments:

Familial Mediterranean Fever (FMF): Colchicine is the standard treatment, reducing attack severity and preventing amyloidosis. Safe for long-term use and during pregnancy.
PFAPA Syndrome: Treatment focuses on improving life quality until spontaneous resolution. Options include glucocorticoids, prophylactic therapy with colchicine, cimetidine, tonsillectomy, and IL-1 antagonists.
Hyperimmunoglobulin D Syndrome (HIDS): Canakinumab during episodes; NSAIDs or steroids as supportive treatment.
Tumour Necrosis Factor Receptor-Associated Periodic Syndrome (TRAPS): Monthly canakinumab and nonspecific anti-inflammatory agents, including steroids.
Neonatal Onset Multisystem Inflammatory Disease (NOMID): Treated with canakinumab.

Medications Used Across Various Syndromes:

Corticosteroids, colchicine, and biologics like canakinumab.
Thalidomide, etanercept, and anti-IL-1 drugs for targeted therapy.
NSAIDs, TNF inhibitors, and methotrexate for specific inflammatory symptoms.

Conclusion

Given the rarity and recurring nature of these conditions, it is essential to seek specialised medical advice and the most current treatment protocols. For individuals seeking to navigate the challenges presented by periodic fever syndromes or for those supporting a loved one, staying informed and prepared to manage symptoms is of paramount importance.

Frequently Asked Questions

Q1. What triggers periodic fevers?
A1. Periodic fevers are typically triggered by a genetic mutation, specifically a missense mutation in the mevalonic kinase (MVK) gene. This condition often manifests during the first year of life, particularly in individuals from Western Europe, and is characterised by recurrent fever episodes with symptom-free intervals.

Q2. Why does my fever keep coming back?
A2. Recurrent or fluctuating fevers in adults may be attributed to various factors. Chronic conditions such as lupus and arthritis are common culprits. Other potential causes include stress, changes in sleep patterns, and the use of certain medications. In some cases, an inaccurate thermometer might also be responsible for the perception of a recurring fever.

Q3. What treatments are available for periodic fever syndrome?
A3. Treatment options for periodic fever syndrome may include a short course of steroids, which can help shorten or stop the fever episode. Additionally, medications like cimetidine or colchicine may be prescribed to manage the syndrome.

Q4. How long do episodes of fever last in those with periodic fever syndrome?
A4. The duration of fever episodes in individuals with periodic fever syndrome can vary. The original input needed to provide an answer to this question.