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Diagnostic Criteria for Infrequent Episodic Tension-Type Headache (IETTH)

(1) At least 10 episodes occurring on <1 day per month on average (<12 days per year) and fulfilling criteria 2-4.
(2) Headache lasting from 30 minutes to 7 days.
(3) Headache has at least two of the following characteristics:
① Bilateral location; ② Pressing/tightening (non-pulsating) quality; ③ Mild or moderate intensity; ④ Not aggravated by routine physical activity such as walking or climbing stairs.
(4) Both of the following:
① No nausea or vomiting (anorexia may occur); ② No more than one of photophobia or phonophobia.
(5) Not attributed to another disorder.
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