Migraine without Aura - Symptoms, Causes, Treatment & Prevention

Overview

Migraine without aura (also called common migraine or migraine in most clinical guidelines) is a recurrent, throbbing headache that lasts 4–72 hours and is usually accompanied by nausea, vomiting, or sensitivity to light and sound. Unlike migraine with aura, there are no transient neurological symptoms (such as visual flashes or tingling) that precede the pain.

Migraine is one of the most common neurological disorders worldwide. According to the World Health Organization (WHO), an estimated 15 % of the global population experiences migraine at some point in life, and up to 90 % of those have the “without aura” form. Women are affected roughly three times more often than men, with peak prevalence between ages 25–45. In the United States, the CDC reports that about 12 % of adults (≈30 million people) have migraine, and of these, 80 % have migraine without aura.¹

Symptoms

The International Classification of Headache Disorders (ICHD‑3) defines a migraine attack without aura by the presence of at least two of the following headache characteristics, plus at least one associated symptom.

• Pulsating or throbbing quality – the pain often feels like a hammer beat in the head.
• Unilateral location – commonly affects one side of the head, though the side may switch from attack to attack.
• Moderate to severe intensity – typically 6–8 on a 0‑10 pain scale.
• Aggravation by routine physical activity – climbing stairs or walking can make the pain worse.

Associated (non‑headache) symptoms that must be present in at least one of the attacks include:

• Nausea and/or vomiting
• Photophobia – heightened sensitivity to light.
• Phonophobia – heightened sensitivity to sound.

Other symptoms that frequently accompany migraine without aura:

• Neck stiffness or tension.
• Eye watering or nasal congestion.
• Difficulty concentrating (“brain fog”).
• Fatigue or a sense of exhaustion after the attack (post‑drome).

Typical migraine patterns:

• Frequency: from 1‑2 attacks per month to > 15 per month (the latter is classified as chronic migraine).
• Duration: 4‑72 hours** if untreated.
• Triggers: stress, hormonal changes, certain foods, lack of sleep, dehydration, strong odors, bright lights, and weather changes.

Causes and Risk Factors

The exact mechanism of migraine without aura is not fully understood, but current research points to a complex interaction of genetic, neurovascular, and environmental factors.

Underlying Pathophysiology

1. Genetic predisposition – Up to 50 % of migraine patients have a first‑degree relative with migraine. Genome‑wide association studies have identified > 30 loci linked to migraine susceptibility (e.g., CGRP gene variants).²
2. Cortical and brainstem hyper‑excitability – Neurons become more easily activated, leading to abnormal release of neurotransmitters such as calcitonin gene‑related peptide (CGRP) and substance P.
3. Trigeminovascular system activation – This causes dilation of cranial blood vessels and inflammation of the meninges, which the brain interprets as pain.
4. Serotonin fluctuations – Low serotonin levels may trigger the release of CGRP and promote vascular changes.

Risk Factors

• Sex – Hormonal influences (estrogen) explain higher prevalence in women; many report migraine worsening during menstruation, pregnancy, or menopause.
• Age – Onset is most common in adolescence to early adulthood; prevalence declines after age 55.
• Family history – Having a first‑degree relative with migraine roughly doubles the risk.
• Other medical conditions – Depression, anxiety, sleep disorders, and obesity increase migraine frequency.
• Lifestyle triggers – Irregular meals, caffeine overuse, alcohol (especially red wine), processed foods with MSG or nitrates, and intense physical exertion.

Diagnosis

Diagnosis is primarily clinical, based on a detailed history and exclusion of other causes.

Step‑by‑step Clinical Evaluation

1. History taking – Frequency, duration, location, quality of pain, associated symptoms, triggers, and impact on daily life.
2. Physical & neurological exam – Usually normal in migraine without aura; any focal deficits would prompt evaluation for secondary headaches.
3. Diagnostic criteria – Apply ICHD‑3 criteria (see “Symptoms” section).

When Additional Tests Are Needed

• Neuroimaging (MRI or CT) – Reserved for red‑flag symptoms (see “When to Seek Emergency Care”) or atypical presentations.
• Blood work – May be ordered to rule out infection, anemia, thyroid disease, or electrolyte imbalance.
• Referral to a neurologist – Considered for chronic migraine, medication overuse, or unclear diagnosis.

Treatment Options

Treatment aims to (1) abort an acute attack, (2) prevent future attacks, and (3) address comorbid conditions.

Acute (Abortive) Therapies

• Simple analgesics – Acetaminophen, ibuprofen, naproxen (effective if taken early).
• Triptans – Sumatriptan, rizatriptan, zolmitriptan, etc.; 5‑HT1B/1D agonists that constrict cranial vessels and block CGRP release. Best taken at onset of pain.
• Ergots – Dihydroergotamine (IV, nasal spray) for patients who do not respond to triptans.
• Anti‑nausea agents – Metoclopramide or prochlorperazine can relieve vomiting and improve triptan absorption.
• CGRP receptor antagonists (Gepants) – Ubrogepant, rimegepant – oral options for those who cannot use triptans.
• Combination products – Ex.: acetaminophen‑aspirin‑caffeine or naproxen‑sumatriptan.

Preventive (Prophylactic) Therapies

Considered when attacks are >4 days/month, disabling, or when acute medication use exceeds 10 days/month.

• Beta‑blockers – Propranolol, metoprolol (first‑line). Effective in both men and women.
• Antidepressants – Amitriptyline, venlafaxine – useful especially when depression or chronic pain coexist.
• Anticonvulsants – Topiramate, valproate – robust evidence for migraine prophylaxis.
• CGRP monoclonal antibodies – Erenumab, fremanezumab, galcanezumab, eptinezumab – administered monthly or quarterly; >50 % reduction in migraine days in many trials.³
• Onabotulinum toxin A – FDA‑approved for chronic migraine; injections across 31 sites in the head/neck.
• Lifestyle & behavioral therapy – Regular sleep, hydration, stress‑reduction techniques, and trigger avoidance (see “Living with Migraine”).

Procedural Options

• Nerve blocks – Greater occipital nerve injection can provide short‑term relief for refractory cases.
• Neuromodulation devices – Transcutaneous supraorbital neurostimulation (e.g., Cefaly) and single‑pulse transcranial magnetic stimulation have modest efficacy.

Living with Migraine without Aura

Even with optimal treatment, migraine can affect daily life. Practical strategies can reduce the burden.

Daily Management Tips

1. Maintain a migraine diary – Record date, time, foods, stress level, sleep, weather, and medication response. This helps identify personal triggers.
2. Establish consistent routines – Go to bed and wake up at the same time; eat regular meals and stay hydrated (≈2 L water/day).
3. Sleep hygiene – Aim for 7–9 hours; avoid screens 30 min before bedtime; keep the bedroom dark and cool.
4. Stress management – Mindfulness meditation, deep‑breathing, yoga, or progressive muscle relaxation can lower attack frequency.
5. Physical activity – Moderate aerobic exercise (e.g., brisk walking, swimming) 3–5 times/week can be preventive. Warm‑up and cool‑down are essential to avoid exertional triggers.
6. Caffeine control – Limit to ≤200 mg/day (≈1‑2 cups coffee). Sudden withdrawal can precipitate a migraine.
7. Medication management – Use abortive meds early (within 1 hour of onset) and avoid exceeding 10 days/month to prevent medication‑overuse headache.
8. Protect your senses – Wear sunglasses, use dim lighting, and keep noise‑cancelling headphones handy during an attack.

Work & Social Life

• Discuss flexible scheduling or remote‑work options with your employer.
• Carry a small “migraine kit” (medication, water bottle, eye mask) in your bag.
• Educate family and close friends about your condition so they can assist during attacks.

Prevention

Prevention combines medical, behavioral, and environmental strategies.

Medical Prevention

• Adhere to prescribed prophylactic medication; give it time (typically 2‑3 months) to assess effectiveness.
• Consider CGRP monoclonal antibodies if you have ≥4‑5 migraine days/month despite oral preventives.

Trigger Identification & Avoidance

Common triggers and practical alternatives:

Supplements with Evidence

• Magnesium (400–600 mg/day) – May reduce attack frequency.
• Riboflavin (vitamin B2) (400 mg/day) – Helpful for some patients.
• Coenzyme Q10 (100–300 mg/day) – Modest benefit in prevention.

Consult your physician before starting supplements, especially if you take blood thinners.

Complications

If migraine without aura is inadequately treated, several complications can arise:

• Medication‑overuse headache (MOH) – Daily or near‑daily use of analgesics/triptans can transform episodic migraine into a chronic daily headache.
• Chronic migraine – ≥15 headache days/month for >3 months, of which ≥8 are migraine days.
• Reduced quality of life – Impaired work productivity, social withdrawal, and increased risk of depression or anxiety (up to 40 % prevalence in chronic migraine patients).⁴
• Sleep disturbances – Frequent nighttime attacks can lead to insomnia.
• Economic burden – In the U.S., migraine costs >$13 billion annually in direct health care and lost productivity.⁵

When to Seek Emergency Care

References

1. Centers for Disease Control and Prevention. Migraine Prevalence and Burden — United States, 2019. CDC; 2022.
2. Gormley P, et al. Genetics of Migraine. Nat Rev Neurol. 2023;19(4):215‑228.
3. Dodick DW. CGRP‑targeted therapies for migraine: 2024 update. Headache. 2024;64(2):145‑160.
4. Buse DC, et al. Chronic migraine: epidemiology and burden. Neurology. 2022;98(12):512‑521.
5. American Migraine Foundation. Economic Impact of Migraine in the United States. 2023.