Greater Occipital Nerve Pulsed Radiofrequency in Cervicogenic Headache

Inclusion Criteria: * Diagnosed with cervicogenic headache according to ICHD-3 criteria * Cranial and cervical spine imaging is available * Number of headache days per month 5 and/or more * Inadequate benefit from pharmacological treatments or physical therapy methods used * Volunteer patients who can understand and approve the treatment and the informed consent form and who can comply with the treatment Exclusion Criteria: * History of secondary headache other than cervicogenic headache according to ICHD-3 criteria * Cervical nerve root irritation and/or spinal stenosis symptoms and signs * Sensory deficit findings in the greater occipital nerve dermatome * Craniocervical defect or other anatomical abnormality in the target area or nearby the procedure * Local or systemic infection * Received nonpharmacological treatment within the last 3 months (physical therapy, botulinum toxin A, acupuncture, ozone, cognitive behavioral therapy, etc.) * Pregnancy or suspected pregnancy * Known allergy to local anesthetic drugs * History of malignancy * Known organic disease of the brain and spinal cord * History of cranial/cervical surgery within the last 1 year * Bleeding-clotting disorder or oral anticoagulant use * Comorbid disease that may cause headache (uncontrolled hypertension, intracranial lesion, etc.) * Compliance with treatment and treatment results diseases that may affect the evaluation (psychiatric disorder, dementia, etc.) * Those who request re-treatment due to the emergence of contralateral pain or other types of pain during the follow-up period after treatment * Those who do not accept treatment