Chronic Migraine – Causes, Symptoms and Treatment
Chronic migraine is a neurological condition defined by headaches occurring on at least 15 days per month for more than 3 months. It is one of the most common neurological disorders and significantly impacts quality of life.
Things worth knowing about "Chronic Migraine"
Chronic migraine is a neurological condition defined by headaches occurring on at least 15 days per month for more than 3 months. It is one of the most common neurological disorders and significantly impacts quality of life.
What is Chronic Migraine?
Chronic migraine is a neurological disorder characterized by recurring, often one-sided headache attacks. By definition, chronic migraine is diagnosed when headaches occur on at least 15 days per month for more than 3 consecutive months, with at least 8 of those days meeting the criteria for migraine. When headaches occur on fewer than 15 days per month, the condition is classified as episodic migraine.
Causes and Risk Factors
The exact causes of chronic migraine are not yet fully understood. It is believed that a combination of genetic, neurological, and environmental factors contributes to its development.
- Medication overuse: One of the most common risk factors is the overuse of pain or migraine medications on more than 10–15 days per month, which can lead to medication-overuse headache and promote chronification.
- Genetic predisposition: Migraine tends to run in families, suggesting a hereditary component.
- Hormonal factors: Particularly in women, hormonal fluctuations related to the menstrual cycle play an important role.
- Psychological stress: Stress, anxiety disorders, and depression can contribute to the transition from episodic to chronic migraine.
- Sleep disturbances and lifestyle factors: Irregular sleep patterns, lack of physical activity, and certain dietary habits can trigger migraine attacks.
Symptoms
The symptoms of chronic migraine are similar to those of episodic migraine but occur far more frequently. Typical features include:
- One-sided, pulsating or throbbing headache of moderate to severe intensity
- Nausea and/or vomiting
- Sensitivity to light (photophobia) and sound (phonophobia)
- Worsening of pain with physical activity
- In some patients: migraine with aura – temporary neurological disturbances such as visual disturbances, tingling, or speech difficulties before the headache
- Persistent fatigue and difficulty concentrating even between attacks
Diagnosis
Chronic migraine is diagnosed clinically, based on the patient´s medical history and symptom description. There is no single test that can definitively confirm the condition.
- Headache diary: Patients are asked to keep a diary for at least 4 weeks, recording the frequency, duration, intensity, and accompanying symptoms of their headaches.
- Neurological examination: A physical and neurological examination is performed to rule out other causes of frequent headaches.
- Imaging techniques: MRI or CT scans of the head are used when warning signs (so-called red flags) suggest an underlying serious condition.
Treatment
The treatment of chronic migraine involves a combination of pharmacological and non-pharmacological approaches.
Pharmacological Treatment
- Preventive medications: These include beta-blockers (e.g., metoprolol, propranolol), anticonvulsants (e.g., topiramate, valproic acid), tricyclic antidepressants (e.g., amitriptyline), and calcium channel blockers.
- CGRP monoclonal antibodies: Newer biologics specifically approved for migraine prevention, such as erenumab, fremanezumab, and galcanezumab, target the calcitonin gene-related peptide (CGRP) pathway, which plays a central role in migraine attacks.
- Botulinum toxin A (OnabotulinumtoxinA): Injections at defined points on the head and neck are specifically approved for the treatment of chronic migraine.
- Acute therapy: Triptans, analgesics, and non-steroidal anti-inflammatory drugs (NSAIDs) are used to treat acute attacks but should not be used too frequently due to the risk of medication-overuse headache.
Non-Pharmacological Treatment
- Regular aerobic exercise (e.g., swimming, cycling, jogging)
- Relaxation techniques such as progressive muscle relaxation or biofeedback
- Cognitive behavioral therapy (CBT) for co-occurring psychological conditions
- Regular sleep-wake schedules and a balanced diet
- Identification and avoidance of personal trigger factors
Prognosis and Disease Course
With consistent treatment and lifestyle adjustments, many patients can achieve a significant reduction in headache days and an improvement in quality of life. Some patients with chronic migraine may revert to the episodic form. Early and consistent therapy, along with avoiding medication overuse, is key to a favorable outcome.
References
- Headache Classification Committee of the International Headache Society (IHS): The International Classification of Headache Disorders, 3rd edition. Cephalalgia, 2018;38(1):1–211.
- Diener HC et al.: Treatment of Migraine Attacks and Prevention of Migraine. Guidelines of the German Society of Neurology (DGN), 2022.
- Silberstein SD: Preventive Migraine Treatment. Continuum (Minneap Minn), 2015;21(4):973–989. DOI: 10.1212/CON.0000000000000199.
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