Natural subgroups of tension-type headache: A population-based study

Area of Science:

• Neurology
• Headache Medicine
• Clinical Epidemiology

Background:

• Tension-type headache (TTH) is commonly defined as bilateral, non-pulsating, mild-to-moderate intensity headaches.
• Current diagnostic criteria may not fully capture the diverse clinical presentations of TTH.
• Understanding TTH heterogeneity is crucial for accurate diagnosis and treatment.

Purpose of the Study:

• To identify and characterize natural subtypes of tension-type headache (TTH) using clinical data.
• To explore variations in symptomatology beyond current diagnostic classifications.
• To provide a more nuanced understanding of TTH heterogeneity.

Main Methods:

• Secondary analysis of a nationwide population-based web survey data on headache and sleep in South Korea (October 2020).
• Categorical variables from the International Classification of Headache Disorders (ICHD-3) criteria for TTH were analyzed.
• A four-class model was determined to be optimal for classifying TTH subtypes.

Main Results:

• A total of 954 participants with TTH were identified from 3030 participants.
• Four distinct TTH subtypes were identified: 'classic TTH' (43.3%), 'severe TTH' (6.9%), 'unilateral TTH' (39.4%), and 'TTH with photophobia' (10.4%).
• Subtypes differed significantly in headache intensity, impact (HIT-6 scores), and specific symptoms like laterality and photophobia, with 'severe TTH' and 'TTH with photophobia' showing higher impact.

Conclusions:

• Four distinct subgroups of tension-type headache (TTH) were identified.
• Each identified TTH subtype exhibits unique clinical characteristics.
• These findings enhance the understanding of TTH heterogeneity and may inform future diagnostic approaches.