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average pain intensity, OPRM1 rs2075572 and rs9322447 may influence postoperative maximal pain intensity. RETN rs3745367 was associated with postoperative average pain intensity, OPRM1 rs2075572 and rs9322447 may influence postoperative maximal pain intensity. Cervicogenic headache (CEH) is a type of headache that is considered to be originated from the upper cervical spine. There are conflicting results in studies showing changes in the cervical spine in patients with CEH. We aimed to compare the cervical radiographs of patients with