Epidemiology of Itch

Area of Science:

• Epidemiology
• Dermatology
• Public Health

Background:

• Itch is the most frequent dermatological symptom, associated with various acute and chronic skin conditions, as well as systemic diseases like renal disease, cholestasis, and neurological disorders.
• The diverse nature of itch has historically led to underestimation of its epidemiological significance.
• Epidemiological assessment in community and specific populations is vital for health planning and understanding environmental disease associations.

Purpose of the Study:

• To summarize key epidemiological facts regarding itch prevalence in the general population and specific patient cohorts.
• To highlight the importance of studying itch beyond clinical settings.

Main Methods:

• Review of epidemiological data on itch prevalence.
• Analysis of prevalence estimates including point, 12-month, and lifetime prevalence.
• Inclusion of data from dermatological patients and the general population.

Main Results:

• The prevalence of itch among dermatological patients is 54.4%.
• In the general population, point prevalence for acute itch is 8.4% and for chronic itch is 13.5%.
• Lifetime prevalence of chronic itch in the general population reaches 22%, indicating a significant public health concern.

Conclusions:

• Chronic itch affects a substantial portion of the population, with 22% experiencing it lifetime.
• Epidemiological research on itch must extend beyond clinical populations to encompass the general public.
• Understanding itch epidemiology is essential for effective health planning and identifying contributing environmental factors.