Chronic headache
Chronic daily headache (CHD) refers to frequent headaches that occur more than 15 days a month and that headaches last more than 4 hours a day. There are two types: primary and secondary. Primary CHD refers to headaches of more than 15 days per month without organic or systemic diseases. A survey shows that 4-5% of the total population Primary CHD. Chronic tension headache (ie, neurological headache) occupies the first place in CHD. The main clinic visit is chronic vascular migraine
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