Interrelations between migraine and tension-type headache in the general population

Area of Science:

• Epidemiology
• Neurology
• Public Health

Background:

• Headache disorders are common, impacting general populations worldwide.
• Understanding the distinct characteristics and prevalence of primary headache disorders is crucial for effective diagnosis and management.
• Previous models have suggested a continuum between migraine and tension-type headache, necessitating further investigation.

Purpose of the Study:

• To determine the prevalence and sex distribution of primary headache disorders in a general population.
• To analyze the characteristics and interrelationships between different headache types.
• To evaluate the validity of the continuum-severity model for headache disorders.

Main Methods:

• A cross-sectional epidemiological survey was conducted on a general population sample.
• Headache diagnoses were made using a structured interview and neurological examination based on International Headache Society criteria.
• Prevalence, sex distribution, and headache characteristics were assessed.

Main Results:

• Migraine attacks demonstrated an all-or-none pattern, with severity and frequency uncorrelated.
• Tension-type headache showed a graded phenomenon, with increasing severity correlating with increased frequency.
• Prevalence rates included 6% for migraine without aura, 4% for migraine with aura, 63% for episodic tension-type headache, and 3% for chronic tension-type headache.

Conclusions:

• Migraine and tension-type headache are distinct entities, supporting their separation in diagnostic criteria.
• The findings contradict the continuum-severity model, suggesting these are not points along a single spectrum.
• Terms like "combination headache" or "mixed headache" should be avoided in clinical practice.