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Why Do I Keep Getting Headaches? Common Causes of Frequent Headaches

The most common causes of frequent headaches are tension-type headaches (affecting roughly 1 in 4 adults), migraine (affecting about 1 in 7 adults worldwide), and medication overuse headache, in which regular use of pain relievers keeps headaches returning. Headaches that have recently changed in character, are severe, or come with other symptoms warrant prompt evaluation.

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The three most common causes of recurring headaches

Tension-type headaches are the most common type overall, affecting roughly one in four adults worldwide. They feel like pressure or tightness around the head, usually on both sides, and are not typically accompanied by nausea or significant light and sound sensitivity. They are often related to stress, poor sleep, or prolonged poor posture.

Migraine is a neurological condition that causes moderate to severe headaches, often one-sided and throbbing, frequently worsened by activity. Many people with migraine are sensitive to light and sound, and some experience nausea. Migraine affects approximately 14% of the global population — roughly one in seven adults — and is frequently underdiagnosed, including in people who have never had an aura 1.

Medication overuse headache is one of the least recognized but most common causes of escalating headache frequency. If you are taking over-the-counter pain relievers for headaches more than ten to fifteen days per month, the medication itself can become part of the cycle — triggering what are called rebound headaches. This affects roughly 1–2% of the population and is among the leading causes of chronic daily headache 1. Breaking the cycle usually requires guidance from a clinician.

Common triggers that keep headaches coming

Even when you know your headache type, triggers can drive frequency. Common ones include:

  • Disrupted or insufficient sleep (and in some cases, excessive sleep)
  • Skipping meals or dehydration
  • Caffeine — both too much and caffeine withdrawal
  • Alcohol
  • Stress and anxiety
  • Hormonal changes, particularly around menstruation
  • Screen time and eye strain
  • Strong smells or bright lights

Identifying your personal triggers — often through a headache diary — can meaningfully reduce how often headaches occur 2.

When frequent headaches become chronic

Chronic daily headache is defined as headache occurring on fifteen or more days per month for more than three months. It is a significant burden and warrants a thorough evaluation with a clinician — not just more over-the-counter medication 1. Migraine that has increased in frequency, tension-type escalation, and medication overuse are the most common contributors.

Effective preventive treatments exist. A clinician or headache specialist can develop a plan that includes preventive therapies, behavioral strategies, and specific treatments for acute episodes 2.

What else might be causing them: less common but important types

Cluster headaches: Severe, one-sided pain around or behind one eye; associated with eye watering and nasal congestion on the same side; occur in clusters over weeks then remit for months; often at the same time of day or night. Less common overall, more common in men.

Hormonal headaches: Reliably occurring just before or during menstruation; may improve during pregnancy or worsen with hormonal birth control. Hormonal birth control containing estrogen and migraine with aura carry a small increased stroke risk — important to discuss with a clinician.

Secondary headaches (caused by another condition): Less common but important when red flag features are present — see the safety box below. New or changed headache pattern, headache worsening with lying down, or new headache in someone over 50 all warrant evaluation to rule out structural or systemic causes 34.

What a clinician will assess

Most headache diagnoses are made from detailed history alone — a careful neurological exam screens for any abnormality 3. What to expect:

  • Detailed headache history and neurological exam: Location, quality, severity, associated symptoms, timing, and triggers — this is where most diagnoses are made
  • Blood pressure measurement: Very high blood pressure can occasionally cause headaches and is always checked
  • MRI or CT scan: Not routinely needed for typical tension or migraine patterns; ordered when red flag features are present, the pattern is new or rapidly changing, or the clinical exam reveals abnormalities
  • Blood tests: If a systemic cause like anemia, thyroid dysfunction, or infection is suspected

A headache diary brought to the appointment — dates, time of day, location, severity, associated symptoms, what you took, and how long it lasted — is one of the most useful things you can bring.

Factors that shape headache evaluation and treatment

Sex and hormones: Migraine is more common in people who menstruate, with women experiencing it at roughly twice the rate of men globally 1. Hormonal fluctuations are a key driver, and hormonal birth control can worsen or improve migraine depending on the person.

Age: New or significantly changed headaches in someone over 50 deserve prompt evaluation to rule out giant cell arteritis and other secondary causes. Migraine often improves after menopause.

Stress and mental health: Anxiety and depression are strongly associated with increased headache frequency. Treating the underlying mood disorder often improves headache control.

Sleep: Both insufficient and excessive sleep are consistent headache triggers. Sleep apnea in particular can cause daily morning headaches.

Caffeine use: Regular caffeine consumption raises the threshold for caffeine withdrawal headaches. Both overuse and abrupt cessation can trigger headaches.

Current medications: Frequent use of pain medications — even OTC options — can perpetuate medication overuse headache 1. Some medications (blood pressure drugs, antidepressants) can also cause headache as a side effect.

Common questions

How do I know if my headaches are migraines?

Migraine headaches are typically moderate to severe, often one-sided and throbbing, and made worse by routine physical activity. Nausea and sensitivity to light or sound are common. You do not need an aura (visual changes before the headache) to have migraine — most people with migraine never have auras. A clinician can make a formal diagnosis based on your headache history.

What is medication overuse headache and how do I avoid it?

If you take any pain reliever — including ibuprofen, acetaminophen, aspirin, or triptans — for headaches more than ten to fifteen days per month, the medication itself can start triggering headaches (rebound headaches). Reducing medication overuse usually requires a plan developed with a clinician, as stopping suddenly can temporarily worsen headaches.

Do I need an MRI for my frequent headaches?

Not necessarily. Most recurrent headaches that fit a recognized pattern (tension-type, migraine) with a normal neurological exam do not require brain imaging. Imaging is prioritized when a headache is sudden and very severe, when the pattern has recently changed, when there are neurological symptoms (weakness, vision change, confusion), or when you are over 50 with a new headache.

Can stress physically cause headaches?

Yes. Stress is one of the most common triggers for both tension-type headaches and migraine. It can increase muscle tension in the neck and scalp, activate the nervous system pathways involved in migraine, and disrupt sleep — all of which contribute to headache. Stress management techniques are a legitimate part of headache treatment.

When should frequent headaches prompt an emergency room visit?

Go to the emergency room if you develop a sudden, severe headache unlike anything you have experienced before, especially one that peaks within seconds. Also go immediately if a headache is accompanied by fever and stiff neck, if you have neurological symptoms (weakness, slurred speech, vision loss), or if you had a recent head injury. These patterns require urgent evaluation.

Talk to a clinician

Nina Osei, NP — Nurse Practitioner

checkups, refills & skin. Gale can match you with a licensed clinician for a visit.

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Headache warning signs that need emergency evaluation

  • —Sudden, severe headache reaching peak intensity within seconds to a minute — sometimes described as 'the worst headache of your life' — call 911 (possible subarachnoid hemorrhage)
  • —Headache with fever, stiff neck, and light sensitivity — seek emergency care immediately (possible meningitis)
  • —New headache after a head injury, even a minor one
  • —Headache with sudden vision changes, weakness, numbness, slurred speech, or confusion — call 911
  • —Progressively worsening headache over days or weeks that is new or different from usual
  • —New headache in someone over 50, especially with tenderness in the temple area (possible giant cell arteritis)
  • —Headache that wakes you from sleep consistently, or is worse lying down
  • —Headache in someone with a history of cancer, HIV, or immune compromise

If you develop a sudden, severe headache unlike anything you have felt before — especially one that peaks within seconds — call 911. This is a medical emergency. Headache with stiff neck, fever, and light sensitivity also requires emergency evaluation right away.

This article is for general educational purposes and does not constitute a diagnosis or substitute for professional medical advice. Please consult a licensed clinician for evaluation of your specific headache symptoms.

References

  1. 1.Stovner LJ, Hagen K, Linde M, Steiner TJ (2022). The global prevalence of headache: an update, with analysis of the influences of methodological factors on prevalence estimates. The Journal of Headache and Pain. doi:10.1186/s10194-022-01402-2 ✓Global prevalence of migraine (~14%, approximately 1 in 7 adults), tension-type headache (~26%), medication overuse headache (~1-2%), and headache on 15+ days per month (~4.6%); female predominance in migraine
  2. 2.National Institute of Neurological Disorders and Stroke (2024). Headache. NINDS Health Information. link ✓Overview of headache types, triggers, medication overuse headache definition, chronic daily headache, and preventive treatment approaches
  3. 3.Wolf SJ, et al. (ACEP Clinical Policies Subcommittee on Acute Headache) (2019). Clinical Policy: Critical Issues in the Evaluation and Management of Adult Patients Presenting to the Emergency Department With Acute Headache. Annals of Emergency Medicine. doi:10.1016/j.annemergmed.2019.07.009 ✓Red flag criteria for serious causes of acute headache including subarachnoid hemorrhage; indications for emergency imaging; guidance on when secondary causes must be urgently excluded
  4. 4.Centers for Disease Control and Prevention (2025). About Meningitis. CDC / National Center for Immunization and Respiratory Diseases. link ✓Recognition of meningitis presenting with headache, fever, and stiff neck as an emergency requiring immediate evaluation

4 sources, numbered by first appearance. General health information, not medical advice — synthetic demonstration content.