| (1) Headache episodes fulfilling criteria 2-4, occurring on average ≥15 days/month for >3 months, and ≥180 days/year. |
| (2) Each headache episode lasts for hours or is continuous. |
| (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 (e.g., walking or climbing stairs). |
| (4) Both of the following: ① No more than one of photophobia, phonophobia, or mild nausea; ② Neither moderate or severe nausea nor vomiting. |
| (5) Not attributed to another disorder. |
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