Migraine and Chronic Headache Department

Migraine and chronic headache can significantly affect quality of life and work performance. Chronic headache generally refers to headache occurring on 15 or more days per month for more than 3 months, although the diagnostic criteria vary according to the specific type of headache. When medication alone does not provide adequate symptom control, selected pain interventions or other preventive treatments may be considered after appropriate medical evaluation.

Diagnosis and Assessment

Diagnostic criteria: According to the International Classification of Headache Disorders (ICHD), chronic migraine is characterized by headache occurring on 15 or more days per month for more than 3 months, with migraine features on at least 8 days per month.
Evaluation of possible causes: Imaging studies such as CT scan or MRI may be considered when symptoms, examination findings, or warning signs suggest a possible secondary cause of headache, but they are not routinely required for every patient.
Assessment of severity: Pain scales such as the Numeric Rating Scale (NRS) or Visual Analog Scale (VAS), together with headache frequency, duration, associated symptoms, and impact on daily activities, may be used to assess the patient’s condition and response to treatment.

Pain Management Interventions

1. Nerve Blocks

Occipital Nerve Blocks: Injection of local anesthetic, sometimes with other medication, around the occipital nerves may be considered for selected headache disorders, including certain patients with migraine or occipital neuralgia.

Supraorbital Nerve Blocks: Injection around the supraorbital nerve may be considered in selected patients with migraine or certain neuralgic and facial pain conditions.

Greater Occipital Nerve Blocks: A commonly used occipital nerve block that may be considered as part of treatment for selected patients with chronic migraine, occipital neuralgia, or other headache disorders.

2. Trigger Point Injections

Myofascial Trigger Point Injections: Local injections may be considered for selected patients with painful trigger points or muscle-related pain involving areas such as the neck and shoulders.

Botulinum Toxin Injections (Botox): Botulinum toxin may be used as preventive treatment for appropriately selected adults with chronic migraine, with injections administered at specific sites according to the treatment protocol.

3. Radiofrequency Procedures

Radiofrequency procedures use radiofrequency energy to modify pain signaling at a selected nerve or target. They are not routine treatment for migraine itself but may be considered for carefully selected patients when another specific pain generator, such as certain cervical or neuralgic pain conditions, has been identified after specialist assessment.

4. Neuromodulation

Neuromodulation uses electrical or magnetic stimulation to modify activity in neural pathways associated with pain. Depending on the headache disorder, treatment may include non-invasive neuromodulation techniques in selected patients.

Implantable neuromodulation, such as occipital nerve stimulation or cervical spinal cord stimulation, is considerably more invasive and is generally reserved for carefully selected patients with refractory pain conditions after specialist assessment. It is not a routine first-line treatment for migraine or chronic headache.

Benefits and Risks

Benefits: In appropriately selected patients, these treatments may help reduce headache frequency or severity, improve daily functioning and quality of life, and in some cases reduce the need for acute pain medication.

Risks: Potential risks vary according to the procedure and may include pain or bruising at the injection site, bleeding, infection, medication reactions, temporary numbness or weakness, and, rarely, nerve injury or other procedure-specific complications. Treatment should therefore be selected after weighing the potential benefits and risks with a qualified physician.

Conclusion

Interventional pain management can be one component of treatment for selected patients with chronic migraine or chronic headache, particularly when conventional treatment does not provide adequate control. Because chronic headaches can have many different causes, patients should undergo a detailed assessment and consult an appropriate specialist to determine the diagnosis and select a treatment plan suited to their individual condition.