In a 51‑year‑old woman presenting with inflamed gums, mild asthma, chronic cough, dyshidrotic eczema, and increased daytime sweating, what is the likely unifying systemic cause and appropriate work‑up and management?

Evaluation for Eosinophilic Granulomatosis with Polyangiitis (EGPA)

This constellation of symptoms—inflamed gums, mild asthma, chronic cough, dyshidrotic eczema, and increased daytime sweats in a 51-year-old woman—raises significant concern for eosinophilic granulomatosis with polyangiitis (EGPA, formerly Churg-Strauss syndrome), a potentially life-threatening systemic vasculitis that requires urgent evaluation.

Why EGPA Should Be Your Primary Concern

The combination of late-onset or worsening asthma with systemic symptoms (sweats) and multi-organ involvement (gums, skin) is a classic red flag for EGPA 1, 2, 3. This is not simply multiple unrelated conditions—the pattern suggests a unifying systemic disease.

Key Clinical Features Present:

• Asthma component: Chronic cough with mild asthma in a middle-aged woman
• Systemic symptoms: Increased daytime sweats suggesting active inflammation
• Multi-organ involvement: Inflamed gums (oral manifestations of systemic disease 4) and skin changes (dyshidrotic eczema may represent cutaneous vasculitis)

EGPA is fatal if untreated but has >90% favorable outcomes with appropriate therapy 1. Missing this diagnosis has catastrophic consequences.

Immediate Diagnostic Work-Up

Essential Laboratory Tests:

1. Complete blood count with differential: Look specifically for peripheral eosinophilia (absolute eosinophil count >1,000/μL or >10% of WBC)
2. Inflammatory markers: ESR and CRP (typically markedly elevated) 2
3. pANCA-MPO antibodies: Positive in 40-60% of EGPA cases 2
4. Total IgE: Usually significantly elevated 3
5. Comprehensive metabolic panel: Assess for renal involvement
6. Urinalysis: Check for proteinuria or hematuria

Imaging Studies:

• Chest X-ray: Look for transient, patchy infiltrates (common in EGPA) 3
• Sinus CT: Evaluate for chronic sinusitis (present in >90% of EGPA cases) 2

Tissue Diagnosis:

• Skin biopsy of any suspicious lesions: May show eosinophilic infiltration and necrotizing vasculitis 1
• Sinus biopsy if imaging shows abnormalities: Can confirm tissue eosinophilia 2

Alternative Diagnostic Pathway If EGPA Is Excluded

If the above work-up is negative for EGPA, then approach this as multifactorial chronic cough with separate dermatologic issues:

For Chronic Cough 5, 6, 5:

Step 1: Upper Airway Cough Syndrome (UACS)

• Start first-generation antihistamine-decongestant combination
• Expect improvement within 1-2 weeks, complete resolution may take several months
• If partial response with persistent nasal symptoms, add intranasal corticosteroid

Step 2: Asthma Evaluation (if UACS treatment incomplete)

• Perform methacholine challenge testing (negative predictive value ~100%)
• If positive or testing unavailable: Trial inhaled corticosteroids + beta-agonists 7
• Response may take up to 8 weeks
• Consider adding leukotriene inhibitor if incomplete response 7, 5

Step 3: GERD Evaluation

• Consider if above treatments fail
• Note: GERD can be "silent" without typical reflux symptoms 6

For Dyshidrotic Eczema 8:

• First-line: Moisturizers twice daily (moderate certainty evidence)
• Second-line: Topical corticosteroids (potent class for hands/feet)
• Avoid very potent steroids for prolonged periods due to skin atrophy risk

For Inflamed Gums:

• Dental evaluation to exclude periodontal disease
• If periodontal disease excluded, consider this part of systemic process

Critical Pitfalls to Avoid

1. Do not dismiss this as simple asthma plus unrelated skin conditions—the combination with systemic symptoms demands systemic disease evaluation
2. Do not delay eosinophil count and inflammatory markers—these are simple tests that can be life-saving
3. Do not assume normal chest X-ray excludes serious disease—EGPA can present with normal imaging early 5
4. Do not treat empirically with oral corticosteroids before obtaining diagnostic tests—this may mask EGPA and delay diagnosis while allowing progression

When to Refer Urgently

Immediate rheumatology referral if:

• Peripheral eosinophilia (>1,000/μL)
• Constitutional symptoms (fever, weight loss, night sweats)
• Positive pANCA-MPO
• Multi-organ involvement
• Neurologic symptoms develop (peripheral neuropathy occurs in 50-75% of EGPA) 3

Pulmonology referral if:

• Asthma difficult to control
• Abnormal chest imaging
• Need for bronchoprovocation testing 5

The increased daytime sweats are particularly concerning as they suggest active systemic inflammation rather than benign causes. This symptom, combined with the other features, makes systemic vasculitis evaluation non-negotiable before attributing symptoms to common benign conditions.