Chronic Migraine: Causes, Symptoms, and Treatments

Chronic migraine can upend work, relationships, and everyday routines.

This practical guide explains what chronic migraine is, how to spot your unique causes and triggers, the hallmark symptoms, and the full menu of treatments—from daily habits to medications like Nurtec (rimegepant)—so you can create a plan that actually helps.

What Is Chronic Migraine?

According to the ICHD-3 diagnostic criteria, chronic migraine means you have headaches on 15 or more days per month for over three months, and at least 8 of those days have migraine features (such as light sensitivity or pulsating pain). It’s different from episodic migraine (fewer than 15 days/month) and often needs a more comprehensive treatment approach.

Chronic migraine is common yet under-recognized, affecting roughly 1–2% of people worldwide and about 4 million adults in the U.S., per 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 disorder involving brain excitability, pain pathways, and a key neuropeptide called CGRP (calcitonin gene-related peptide). Learn more about CGRP’s role in migraine from the AMF’s overview here. While there’s no single cause, several factors raise the odds of developing chronic migraine:

Genetics: A family history of migraine increases susceptibility.
Medication overuse: Using acute pain meds too frequently can lead to medication overuse headache (MOH), which perpetuates attacks. See the AMF explainer here.
Hormonal shifts: Estrogen fluctuations (menstruation, perimenopause, postpartum) can amplify attack frequency.
Sleep issues: Insomnia, sleep apnea, or irregular schedules heighten risk; review practical sleep hygiene from the CDC here.
Mood and pain conditions: Anxiety, depression, neck/shoulder 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 on their own, but they can flip the switch in a sensitive brain. Tracking yours makes treatment far more effective. Common examples include:

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

Pro tip: Keep a simple diary to log sleep, meals, stress, weather, and attacks. A printable/digital template from AMF can help you spot patterns fast—see options here. A quick triggers overview is also available here.

Signs and Symptoms

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

Pain: Moderate to severe, often one-sided, pulsating or pressure-like, worse with movement.
Sensory: Sensitivity to light, sound, and smells; skin tenderness (allodynia).
Gastrointestinal: Nausea, vomiting, appetite loss.
Neurological: Brain fog, trouble finding words, dizziness/vertigo.
Aura (in some): Visual zigzags or sparkles, tingling, or speech changes before or during pain; learn more about aura here.

How Clinicians Diagnose Chronic Migraine

Diagnosis is clinical—your history and symptom pattern matter most. You’ll likely be asked about monthly headache days, migraine features, and how attacks affect your life. Bring a diary and a full list of meds/supplements and doses. Exams are usually normal; brain imaging is reserved for specific “red flag” situations, not routine migraine. For a clear overview, see the NINDS migraine page.

Seek urgent care for 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. Review a red-flag checklist from AMF here, and call emergency services for any alarming symptoms.

Treatment Options That Work

Effective care usually combines fast-acting acute treatment (to stop individual attacks) 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 (on-the-spot) treatments

NSAIDs/acetaminophen: Often best taken early in an attack; may pair with anti-nausea medication if needed.
Triptans: Migraine-specific options (e.g., sumatriptan). Avoid if you have certain cardiovascular conditions; review choices with your clinician.
Gepants: CGRP receptor antagonists for acute relief, including rimegepant and ubrogepant. See FDA overviews for rimegepant and ubrogepant.
Ditans: Lasmiditan (non-vasoconstrictive) for those who can’t use triptans; FDA overview here.
Antiemetics: Medications like metoclopramide or prochlorperazine can reduce nausea and improve pain response.

Smart use matters: To reduce the risk of medication overuse headache, many 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 AMF guidance here.

Nurtec ODT (rimegepant): What to Know

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

How it works: It blocks CGRP receptors involved in migraine pain signaling.

How it’s taken: Orally disintegrating tablet; many adults use 75 mg for acute treatment (do not exceed one dose in 24 hours). For prevention, a common schedule is 75 mg every other day—follow your clinician’s advice.

Who might benefit: People who can’t take triptans or prefer a non-vasoconstrictive option; those seeking a dual acute/preventive approach for episodic migraine.

Key considerations: Potential interactions with strong CYP3A4 modifiers and certain P-gp/BCRP inhibitors. Always share all medicines and supplements with your clinician.

If you live with chronic migraine, Nurtec may still play a role as an acute option. For prevention specifically in chronic migraine, other therapies 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 can reduce monthly migraine days with favorable tolerability. AMF overview here.
Oral preventives: Options include beta blockers (e.g., propranolol), topiramate, tricyclics (amitriptyline), and SNRIs (venlafaxine), chosen based on your health profile. See AMF’s preventive summary here.
Atogepant: An oral CGRP receptor antagonist for preventive treatment, including chronic migraine in adults; FDA overview here.
Neuromodulation devices: External nerve stimulation devices (trigeminal or vagus) can help some people; 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 here.
Behavioral therapies: Cognitive behavioral therapy (CBT), biofeedback, and relaxation training can reduce attack frequency and disability.
Supplements (ask 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 (brief walks, breathing drills).

Real-Life Example

“Maya” averaged 20 headache days each month, often waking with pain. She built a consistent sleep routine, limited caffeine to mornings, and started a preventive (onabotulinumtoxinA) with an acute gepant for breakthrough attacks. By tracking patterns and making small adjustments, her headache days dropped to 8 within three months—and continued to improve with steady habits.

Build Your Personal Migraine Plan

Know your baseline: Track monthly headache days and migraine features.
Pick your acute toolkit: Choose 1–2 first-line options and a backup; take early in the attack window.
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 medication-free days.
Schedule check-ins: Reassess every 8–12 weeks and adjust based on response and side effects.

Helpful Resources

Bottom Line

Chronic migraine is treatable. With the right mix of acute tools, preventive therapy, and supportive lifestyle habits, most people can significantly reduce monthly migraine days and reclaim their routines. Partner with a clinician, track your patterns, and keep iterating until the plan fits your life.