What Causes HS? The Hidden Triggers Behind a Chronic Mystery

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what causes hs

The first time a patient describes the pain of hidradenitis suppurativa (HS), they often use words like "unrelenting" or "betrayal by the body." What causes HS is not just a dermatological puzzle—it’s a medical enigma that has left millions searching for answers in the shadows of misdiagnosis. The condition, marked by recurrent abscesses, deep cysts, and scarring in areas like the armpits, groin, and buttocks, defies simple explanations. Yet beneath the surface of visible symptoms lies a complex interplay of genetics, immunity, and lifestyle factors that researchers are only beginning to unravel. The frustration is palpable: patients report waiting years for accurate diagnoses, while doctors grapple with a disease that resists conventional treatments.

What makes HS particularly confounding is its dual nature—it behaves like an autoimmune disorder in some cases, yet in others, it mirrors a metabolic or infectious process. The pain, often compared to "walking on broken glass," is disproportionate to the size of the lesions, and the emotional toll compounds the physical suffering. Studies suggest that up to 4% of the global population may have HS, yet awareness remains critically low. The question what causes HS isn’t just academic; it’s a lifeline for those who live with its daily devastation. Without clarity, treatment remains reactive rather than preventive, leaving patients in a cycle of flare-ups and remission.

The search for answers has led scientists to dissect HS at a molecular level, from the role of gamma-secretase in follicular occlusion to the dysfunctional immune responses that turn hair follicles into battlegrounds. Meanwhile, epidemiologists trace patterns linking HS to obesity, smoking, and hormonal imbalances—factors that may accelerate or trigger its onset. What emerges is a condition that is as much about systemic health as it is about skin. The following exploration cuts through the noise to examine the most credible theories on what causes HS, its evolutionary roots, and why some patients experience remission while others face lifelong progression.

what causes hs

The Complete Overview of What Causes HS

Hidradenitis suppurativa is a chronic inflammatory skin disease that primarily targets apocrine gland-bearing areas, though its exact pathogenesis remains elusive. While the condition was first described in the 19th century, modern research has only begun to peel back the layers of its complexity. The core question—what causes HS—has evolved from a focus on bacterial infections to a recognition of a multifactorial etiology involving genetic predisposition, immune dysregulation, and environmental triggers. Unlike acne or eczema, HS does not respond to conventional topical treatments, suggesting a deeper, systemic dysfunction. This realization has shifted the paradigm from viewing HS as a localized skin issue to understanding it as a full-body condition with far-reaching implications.

The diagnostic journey for HS patients is often a marathon. Many spend years undergoing biopsies for suspected cancer, fungal infections, or even syphilis before receiving the correct diagnosis. This delay is partly due to the condition’s mimicry of other dermatological and infectious diseases, but also because what causes HS is not a single factor but a convergence of biological and lifestyle elements. Recent advances in genomics have identified mutations in genes like HSD17B13 and NCSTN, which are linked to increased susceptibility, yet these genetic markers explain only a fraction of cases. The remainder hinges on epigenetic factors—how lifestyle, diet, and stress interact with an individual’s genetic makeup to tip the balance toward inflammation. Understanding these interactions is key to answering the persistent question of what triggers HS in susceptible individuals.

Historical Background and Evolution

The earliest documented cases of what would later be classified as HS appear in medical texts from the 1800s, where physicians described "recurrent abscesses of the axilla" in patients who suffered from what was then termed "acne inversa." The term hidradenitis suppurativa was coined in 1933 by Dr. Hermann Pinkus, who sought to distinguish it from other inflammatory skin conditions. However, it wasn’t until the late 20th century that researchers began to recognize HS as a distinct entity with its own pathophysiological mechanisms. Early theories blamed bacterial overgrowth, particularly Staphylococcus aureus, but antibiotic treatments proved ineffective in the long term, casting doubt on the infectious hypothesis.

The turning point came in the 1990s and 2000s, when dermatologists and immunologists started to explore the role of follicular occlusion—a blockage of hair follicles that leads to inflammation and cyst formation. This theory aligned with the observation that HS lesions often develop in areas with dense apocrine glands, such as the groin, underarms, and anogenital region. However, the question of what causes HS at its root remained unanswered. Genetic studies in the 2010s revealed that HS clusters in families, with first-degree relatives of affected individuals having a 40% higher risk of developing the condition. This hereditary pattern suggested that while genetics play a role, they are not the sole determinant. Environmental factors—such as smoking, obesity, and hormonal fluctuations—were increasingly seen as critical co-factors in disease manifestation.

Core Mechanisms: How It Works

At the cellular level, HS is characterized by a cascade of events beginning with follicular occlusion, where hair follicles become blocked by keratin (a structural skin protein) and sebum. This blockage creates a microenvironment conducive to bacterial colonization, though the bacteria themselves are not the primary drivers of inflammation. Instead, the immune system’s overreaction to these blocked follicles is what sustains the cycle of pain, swelling, and tissue damage. Key players in this process include neutrophils, which release enzymes that break down healthy tissue, and T-cells, which perpetuate chronic inflammation. The result is a vicious cycle: inflammation leads to more occlusion, which triggers further immune responses, and so on.

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What distinguishes HS from other inflammatory skin diseases is its association with metabolic syndrome—a cluster of conditions including obesity, diabetes, and cardiovascular disease. Patients with HS are significantly more likely to develop these comorbidities, suggesting a shared underlying pathology. Research indicates that insulin resistance and elevated levels of inflammatory markers like TNF-alpha and IL-17 may contribute to both HS and metabolic dysfunction. This connection raises the possibility that what causes HS in some individuals may be linked to broader systemic inflammation, rather than isolated skin pathology. Additionally, hormonal imbalances, particularly elevated androgens, have been implicated in the progression of HS, especially in women, who are disproportionately affected.

Key Benefits and Crucial Impact

Understanding the root causes of HS is more than an academic exercise—it is a prerequisite for developing targeted, effective treatments. For decades, patients have been prescribed antibiotics, steroids, and painkillers as band-aid solutions, but these approaches fail to address the underlying mechanisms driving the disease. The shift toward biologics, such as adalimumab and secukinumab, represents a paradigm change, as these drugs target specific pathways (e.g., TNF-alpha or IL-17) implicated in HS pathogenesis. However, even these treatments are not universally effective, underscoring the need for a deeper understanding of what causes HS in individual patients.

The impact of HS extends beyond physical health. The chronic pain, odor, and visible scarring often lead to psychological distress, including depression and anxiety. Patients report social isolation, employment discrimination, and even suicidal ideation, highlighting the urgent need for comprehensive care that addresses both the biological and emotional dimensions of the disease. Public awareness campaigns and advocacy groups, such as the International Hidradenitis Suppurativa Foundation, have played a crucial role in destigmatizing HS and pushing for research funding. Yet, without a clear answer to what triggers HS, progress remains incremental.

"HS is not just a skin disease—it’s a systemic condition that demands a holistic approach. Until we fully understand its causes, we cannot offer patients the relief they deserve." —Dr. Alan Menter, Professor of Dermatology, University of California

Major Advantages

  • Precision Medicine: Identifying genetic and metabolic triggers allows for personalized treatment plans, moving away from one-size-fits-all approaches.
  • Early Intervention: Recognizing environmental and lifestyle factors (e.g., smoking cessation, weight management) can prevent disease progression in at-risk individuals.
  • Biologic Therapies: Targeted drugs like TNF inhibitors have revolutionized HS management by addressing the immune dysfunction at its core.
  • Reduced Comorbidities: Addressing metabolic syndrome and hormonal imbalances can improve overall health and quality of life for HS patients.
  • Patient Empowerment: Clearer insights into what causes HS enable patients to make informed decisions about their care and advocate for better treatment options.

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Comparative Analysis

Factor HS vs. Other Conditions
Genetic Predisposition HS shows strong familial aggregation; linked to genes like HSD17B13. Acne and psoriasis have weaker genetic ties.
Primary Mechanism Follicular occlusion and immune dysregulation; unlike eczema (barrier dysfunction) or rosacea (vascular inflammation).
Metabolic Links HS is strongly associated with obesity, diabetes, and cardiovascular disease—unlike most dermatological conditions.
Treatment Response Resistant to topicals/antibiotics; responds to biologics (e.g., TNF inhibitors), unlike acne (retinoids) or fungal infections (antifungals).
The future of HS research lies in integrating multi-omics approaches—combining genomics, proteomics, and metabolomics—to identify biomarkers that predict disease severity and treatment response. Early-stage studies are exploring the role of the gut microbiome, with some evidence suggesting that dysbiosis (microbial imbalance) may contribute to HS inflammation. If confirmed, probiotics or fecal microbiota transplants could emerge as novel therapies. Additionally, advances in bioengineering, such as lab-grown skin models, are accelerating drug discovery by allowing researchers to test compounds in environments that mimic HS pathology.

Another promising avenue is the development of JAK inhibitors, which modulate immune signaling pathways implicated in HS. Clinical trials are underway to assess their efficacy, particularly for patients who do not respond to TNF inhibitors. On the horizon, gene therapy may offer a cure for those with high-risk genetic mutations, though this remains speculative. Meanwhile, public health initiatives aimed at reducing smoking and obesity—two modifiable risk factors for HS—could significantly lower incidence rates. The key to progress will be collaboration between dermatologists, immunologists, and metabolic specialists to tackle what causes HS from every angle.

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Conclusion

Hidradenitis suppurativa is a condition that has long been overshadowed by more visible or better-funded dermatological diseases. Yet, for those who live with it, the question what causes HS is not just a medical curiosity—it’s a matter of survival. The journey to understanding HS has been marked by misdiagnoses, trial-and-error treatments, and a frustrating lack of answers. However, the tide is turning. As research uncovers the genetic, immunological, and metabolic underpinnings of HS, the possibility of preventive strategies and curative therapies grows closer.

The path forward requires sustained investment in HS research, greater awareness among healthcare providers, and a shift toward patient-centered care. Until then, those affected must navigate a landscape where hope is often tempered by uncertainty. But with each new study, each breakthrough in targeted therapies, the answer to what causes HS becomes clearer—and with it, the promise of a future where this debilitating condition is no longer a mystery, but a manageable part of life.

Comprehensive FAQs

Q: Is HS contagious?

No, HS is not contagious. It is a chronic inflammatory disease with no infectious component, though secondary bacterial infections can occur in open lesions.

Q: Can diet influence what causes HS?

Emerging evidence suggests that anti-inflammatory diets (e.g., Mediterranean diet) may reduce flare-ups, while high-glycemic foods and dairy could exacerbate symptoms in some patients. However, diet alone does not cause HS—it interacts with genetic and immune factors.

Q: Why do some HS patients experience remission?

Remission in HS is often linked to lifestyle changes (e.g., smoking cessation, weight loss) or effective treatment (e.g., biologics). However, remission is not permanent for most; the disease typically returns if triggers persist.

Q: Are there genetic tests for HS?

While genetic testing can identify mutations like HSD17B13, no single test can diagnose HS. Genetic screening is primarily useful for high-risk families or research purposes, not clinical diagnosis.

Q: How does stress affect HS?

Chronic stress elevates cortisol and inflammatory markers, which may worsen HS symptoms. Stress management techniques, such as mindfulness or therapy, are often recommended as adjunct treatments.

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