Chronic Migraine: Causes, Symptoms & Treatment

Chronic migraine affects millions and can disrupt daily life.

In this clear, practical guide, you’ll learn what chronic migraine is, the most common causes and triggers, how to recognize the signs and symptoms, and the full range of treatment options—from lifestyle strategies to medications like Nurtec (rimegepant)—so you can build a plan that actually works.

What is Chronic Migraine?

Chronic migraine is defined by the International Classification of Headache Disorders (ICHD-3) as having headaches on 15 or more days per month for over three months, with at least 8 of those days having migraine features. It’s different from episodic migraine (fewer than 15 days/month) and often requires a different treatment approach.

Chronic migraine is common yet underdiagnosed—affecting roughly 1–2% of people globally and an estimated 4 million adults in the U.S. alone, according to the American Migraine Foundation. Recognizing the pattern is the first step toward effective care.

Causes and Risk Factors

What science suggests

Migraine is a complex neurological condition involving brain excitability, pain pathways, and a neuropeptide called CGRP (calcitonin gene-related peptide). While there isn’t a single cause, several factors raise the risk of developing chronic migraine:

Genetics: A family history of migraine increases your odds.
Medication overuse: Using acute pain medicines too often can lead to medication overuse headache (MOH), which perpetuates chronic migraine. Learn more from the American Migraine Foundation.
Hormonal shifts: Estrogen fluctuations can increase attack frequency.
Sleep problems: Insomnia, sleep apnea, or irregular schedules raise risk.
Mood and pain conditions: Anxiety, depression, neck pain, and other pain disorders often co-occur and can worsen migraine.
High baseline attack load: Frequent episodic migraine can progress to chronic without preventive therapy.

Common Migraine Triggers

Triggers don’t “cause” migraine by themselves, but they can flip the switch in an already sensitive brain. Tracking yours makes treatment more effective.

Sleep disruption: Too little, too much, or inconsistent sleep. See practical tips from the CDC on sleep hygiene.
Stress swings: High stress and the “let-down” period after stress.
Dietary: Skipping meals, dehydration, alcohol, and sometimes foods like aged cheeses or processed meats.
Caffeine: Too much or sudden withdrawal; aim for a steady, modest intake.
Environment: Bright light, screen glare, strong smells, barometric pressure changes.
Hormonal: Menstruation, perimenopause, and postpartum shifts.
Activity swings: Hard workouts after inactivity or inconsistent routines.

Pro tip: Keep a simple diary to log sleep, meals, stress, weather, and attacks. A printable or digital template from the American Migraine Foundation can help you spot patterns fast.

Signs and Symptoms

Migraine is more than “just a headache.” Symptoms can vary by person and by attack:

Pain: Moderate to severe, often one-sided, pulsating or pressure-like, worse with movement
Sensory: Light, sound, and smell sensitivity; skin tenderness (allodynia)
Gastrointestinal: Nausea, vomiting, appetite loss
Neurological: Brain fog, word-finding trouble, dizziness/vertigo
Aura (in some): Visual changes (sparkles, zigzags), tingling, or speech changes that precede or accompany pain; learn more about aura from AMF here.

How Doctors Diagnose Chronic Migraine

Diagnosis is clinical—your history and symptom pattern matter most. A clinician will ask about monthly headache days, migraine features, and disability. Bring a diary and a list of medications and doses. Exams are usually normal; imaging is reserved for specific red flags, not routine migraine. The NINDS offers a helpful overview.

Get urgent care if you have a “worst-ever” thunderclap headache, new neurological symptoms (weakness, confusion, double vision), fever with stiff neck, head injury, or a new pattern after age 50. See the red-flag checklist from the American Headache Society, and call emergency services for any alarming symptoms.

Treatment Options That Work

Effective care often combines acute (on-the-spot) treatment with preventive tools to reduce monthly migraine days. Your plan should be personalized—and it’s okay to mix and match under medical guidance.

Acute (abortive) treatments

NSAIDs/acetaminophen: Best when taken early in an attack; combine with an anti-nausea medication if needed.
Triptans: Migraine-specific (e.g., sumatriptan). Avoid if you have certain cardiovascular conditions; review options with your clinician.
Gepants: CGRP receptor antagonists for acute relief, such as rimegepant and ubrogepant. See FDA overviews for rimegepant and ubrogepant.
Ditans: Lasmiditan (non-vasoconstrictive) for those who cannot use triptans; see FDA overview here.
Antiemetics: Metoclopramide or prochlorperazine can reduce nausea and improve pain response.

Smart use matters: To avoid medication overuse headache, most experts suggest limiting simple analgesics to ≤15 days/month and triptans/combination meds to ≤9–10 days/month. Discuss personalized limits with your clinician and review the AMF guidance.

Nurtec ODT (rimegepant): what to know

Nurtec ODT (rimegepant) is a CGRP receptor antagonist used for the acute treatment of migraine attacks in adults and for the preventive treatment of episodic migraine. For full, current prescribing information, see the FDA listing for rimegepant.

How it works: Blocks CGRP receptors involved in migraine pain signaling.
How it’s taken: Orally disintegrating tablet; typically 75 mg for acute treatment (do not exceed one dose in 24 hours). For prevention, many adults take 75 mg every other day—follow your clinician’s guidance.
Who might benefit: Those who can’t take triptans or prefer a non-vasoconstrictive option; people seeking a dual acute/preventive strategy for episodic migraine.
Common considerations: Potential interactions with strong CYP3A4 modifiers; always share all meds and supplements with your clinician.

If you live with chronic migraine, Nurtec may still play a role for acute treatment of attacks. For prevention specifically in chronic migraine, other options (below) have the strongest evidence and indications.

Preventive therapies

OnabotulinumtoxinA (Botox): FDA-approved specifically for chronic migraine prevention; injections every 12 weeks following the PREEMPT protocol. Learn more from AMF here.
CGRP monoclonal antibodies: Erenumab, fremanezumab, galcanezumab, and eptinezumab reduce monthly migraine days and have favorable tolerability. Overview from AMF here.
Oral preventives: Beta blockers (propranolol), topiramate, tricyclics (amitriptyline), SNRIs (venlafaxine), and others based on your profile. See a preventive overview from AMF here.
Atogepant: An oral CGRP receptor antagonist for preventive treatment, including chronic migraine in adults; see the FDA overview here.
Neuromodulation devices: External nerve stimulation devices (e.g., trigeminal or vagus) can help for some; explore options in this AMF review here.

Non-drug strategies that make a difference

Regular routines: Consistent sleep/wake times, meals, hydration, and movement. Even 20–30 minutes of moderate activity most days can help; see AMF guidance on exercise.
Behavioral therapies: Cognitive behavioral therapy (CBT), biofeedback, and relaxation training reduce frequency and disability; overview here.
Supplements (discuss with your clinician): Magnesium glycinate (often 400–600 mg/day), riboflavin (B2, ~400 mg/day), and CoQ10 have supportive evidence; AMF summary here.
Trigger management: FL-41 tinted lenses for light sensitivity, screen breaks, and stress-buffering habits (short walks, breathing drills).

Real-life example

“Maya” had 20 headache days a month, often waking with pain. She started a sleep routine, limited caffeine to mornings, and used a preventive (onabotulinumtoxinA) plus an acute gepant for breakthrough attacks. With a diary-guided plan, her headache days dropped to 8 within three months—and she kept improving by adjusting triggers and sticking to her schedule.

Build your personal migraine plan

Know your baseline: Track monthly headache days and migraine features.
Pick your acute toolkit: Agree on 1–2 first-line options and a backup; take early.
Add prevention if needed: If you have ≥4 migraine days/month or significant disability—or meet criteria for chronic migraine—discuss preventive therapy.
Guard against MOH: Set monthly limits for acute meds and plan “med-free” days.
Check-ins: Reassess every 8–12 weeks and adjust.

Helpful resources

Bottom line: Chronic migraine is treatable. With the right mix of acute tools, preventive therapy, and lifestyle supports, most people can substantially reduce monthly migraine days and reclaim their routine. Partner with a clinician, track your patterns, and keep iterating until the plan fits your life.