Chronic pruritus: a narrative review

Area of Science:

• Dermatology and Neuroscience
• Pathogenesis of Itch
• Chronic Pruritus Etiology

Background:

• Chronic pruritus is a challenging symptom linked to diverse conditions, including skin, allergic, infectious, neurological, psychological, and systemic diseases.
• Investigating the cause and devising treatment strategies for chronic itch can be complex.
• A thorough understanding of pruritus pathogenesis is crucial for effective clinical management.

Purpose of the Study:

• To comprehensively review the pathogenesis of pruritus.
• To highlight key elements in itch signaling, from skin cells to the central nervous system.
• To guide the diagnostic evaluation and therapeutic strategies for chronic pruritus.

Main Methods:

• Review of current literature on pruritus pathogenesis and management.
• Analysis of the roles of keratinocytes, Merkel cells, mast cells, and nerve fibers in itch signaling.
• Examination of histaminergic and nonhistaminergic pathways and central nervous system interactions.
• Discussion of diagnostic approaches including medical history, physical examination, laboratory tests, skin biopsy, and direct immunofluorescence.

Main Results:

• Pruritus involves complex interactions between skin cells, nerve fibers, and the central nervous system.
• Diagnostic evaluation requires a meticulous, individualized approach based on clinical presentation.
• Treatment strategies must be tailored to the underlying cause, ranging from emollients to systemic therapies and emerging drugs.

Conclusions:

• Effective management of chronic pruritus necessitates a deep understanding of its multifaceted pathogenesis.
• Individualized diagnostic and therapeutic strategies are essential for addressing the diverse causes of chronic itch.
• Emerging therapies offer new hope for patients with refractory chronic pruritus.