Headache and the greater occipital nerve

Area of Science:

• Neurology
• Pain Medicine

Background:

• Idiopathic headache is a common neurological complaint.
• Migraine is a frequent diagnosis for severe headaches.
• The etiology of some headache presentations remains unclear.

Purpose of the Study:

• To investigate the clinical features of 500 patients with idiopathic headache.
• To identify potential underlying causes for headaches misdiagnosed as migraine.
• To explore the role of greater occipital nerve (GON) irritation in headache etiology.

Main Methods:

• Clinical assessment of 500 patients presenting with idiopathic headache.
• Subgroup analysis of 383 patients diagnosed with migraine.
• Diagnostic and therapeutic nerve blocks of the greater occipital nerve (GON).
• Evaluation of treatment outcomes including local anesthetic injection, Depomedrol injection, and surgical nerve division.

Main Results:

• 184 out of 383 (48%) patients diagnosed with migraine experienced headaches attributed to greater occipital nerve (GON) irritation.
• Local anesthetic injection of the GON provided immediate headache arrest.
• Depomedrol injection prevented headaches for up to 4 weeks.
• Surgical division of the GON offered relief for several months.

Conclusions:

• A significant subset of patients diagnosed with migraine may actually suffer from headaches caused by neural irritation.
• Greater occipital nerve (GON) irritation is a distinct cause of headache, proposed to be termed 'occipital neuralgia'.
• Targeted treatment of the greater occipital nerve (GON) can effectively manage these specific headache presentations.