Headache causes
Pro Research Analysisby 
Searched over 200M research papers for "headache causes"
Primary Headache Causes: Migraine, Tension-Type, and Cluster Headaches
Primary headaches are those not caused by another medical condition. The most common types are migraine, tension-type, and cluster headaches. These headaches are linked to changes in brain excitability, especially in the thalamus, cortex, and hypothalamus, which play key roles in the onset and symptoms of migraine and cluster headaches 210. Migraine can be triggered by stress, fatigue, certain foods (like chocolate, coffee, wine, and cheese), and hormonal changes . Cluster headaches, though less common, are extremely painful and also involve abnormal activity in the hypothalamus . Genetics also play a role, as people with a family history of primary headaches are at higher risk, and some rare forms of migraine are linked to specific gene mutations .
Secondary Headache Causes: Underlying Medical Conditions
Secondary headaches are caused by other health problems and can be serious or even life-threatening. Ominous causes include subarachnoid hemorrhage, cervical artery dissection, cerebral venous thrombosis, meningitis, obstructive hydrocephalus, and brain tumors 16. Other secondary causes include temporal arteritis, intracranial masses, pseudotumor cerebri, hypertensive encephalopathy, sinus disease, and spontaneous intracranial hypotension 68. In older adults, secondary headaches become more common and can be due to conditions like giant cell arteritis, sleep apnea, cardiac issues, or medication side effects .
Ocular and Visual Causes of Headache
Problems with the eyes can also cause headaches. These include headaches from uncorrected refractive errors, convergence insufficiency, and accommodative spasm. Such headaches are usually felt in the front of the head, often worsen by the end of the day, and are linked to prolonged near work. Treatment may involve glasses, eye exercises, or other therapies 468.
Lifestyle and Environmental Triggers
Lifestyle factors can trigger or worsen headaches. Common triggers include poor sleep, hunger, dehydration, and certain foods or drinks (such as alcohol, dairy, chocolate, and caffeine) 58. Caffeine can both trigger and relieve headaches, depending on the amount and frequency of use . Nutritional deficiencies, such as low intake of magnesium or thiamine, are also linked to increased headache risk . Fasting and changes in sleep patterns, especially during events like Ramadan, can increase headache frequency . Stress and changes in daily routine are additional common triggers .
Brain Structure, Function, and Headache Mechanisms
Headaches involve complex interactions between the brain and nervous system. The hypothalamus, thalamus, and brainstem are key regions involved in headache disorders, affecting pain processing and sensitivity to sensory inputs 210. Migraine aura is linked to waves of activity in the cortex, known as cortical spreading depression, which can cause visual and sensory symptoms 210. The release of neuropeptides, especially calcitonin gene-related peptide, is a major factor in headache pain .
Special Considerations in Older Adults
In people over 65, new-onset primary headaches are rare and should be carefully evaluated to rule out secondary causes. Headaches in this age group are more likely to be due to underlying medical conditions, and treatment must consider other health issues and medications .
Conclusion
Headaches have many possible causes, ranging from primary disorders like migraine and tension-type headaches to secondary causes such as serious medical conditions, eye problems, and lifestyle factors. Understanding the underlying cause is essential for effective treatment and to rule out dangerous conditions, especially when new or severe symptoms appear 1689.
Sources and full results
Most relevant research papers on this topic