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  2. Thunderclap headache - Wikipedia

    en.wikipedia.org/wiki/Thunderclap_headache

    A thunderclap headache is a headache that is severe and has a sudden onset. It is defined as a severe headache that takes seconds to minutes to reach maximum intensity. [1] [2] Although approximately 75% are attributed to "primary" headachesheadache disorder, non-specific headache, idiopathic thunderclap headache, or uncertain headache disorder—the remainder are secondary to other causes ...

  3. Neurologists reveal 15 subtle migraine symptoms — that aren't ...

    www.aol.com/neurologists-reveal-15-subtle...

    A migraine headache can throw your whole day off track. But if you can learn to pick up on your subtle migraine warning signs, you might able to avoid the pain entirely, experts say. "This is a ...

  4. Doctors Explain What It Means When You Have Chills But No Fever

    www.aol.com/9-reasons-might-chills-no-210200160.html

    One potentially life-threatening example is meningitis, which can cause chills with or without a fever, along with symptoms like a stiff neck, sensitivity to light and sound, and lethargy.

  5. Reflex syncope - Wikipedia

    en.wikipedia.org/wiki/Reflex_syncope

    Carotid sinus syncope is due to pressure on the carotid sinus in the neck. [2] The underlying mechanism involves the nervous system slowing the heart rate and dilating blood vessels, resulting in low blood pressure and thus not enough blood flow to the brain. [2] Diagnosis is based on the symptoms after ruling out other possible causes. [3]

  6. Cortisol awakening response - Wikipedia

    en.wikipedia.org/wiki/Cortisol_awakening_response

    Waking up earlier in the morning increases the response. [11]Shift work: nurses working on morning shifts with very early awakening (between 4:00–5:30 a.m.) had a greater and prolonged cortisol awakening response than those on the late day shift (between 6:00–9:00 a.m.) or the night shift (between 11:00 a.m.–2:00 p.m.). [12]

  7. 12 Foods That Can Cause a Headache or Migraine - AOL

    www.aol.com/12-foods-cause-headache-migraine...

    A headache happens when blood vessels, nerves, or muscles in your head or neck get irritated. For most people, common triggers like stress, dehydration, or even skipping a meal can bring one on.

  8. Occipital neuralgia - Wikipedia

    en.wikipedia.org/wiki/Occipital_neuralgia

    The conditions most easily mistaken with ON for other headache and facial pain disorders include migraine, cluster headache, tension headache, and hemicrania continua. Mechanical neck pain from an upper disc, facet, or musculoligamentous sources may refer to the occiput, but is not classically lancinating or otherwise neuropathic and should not ...

  9. Headache - Wikipedia

    en.wikipedia.org/wiki/Headache

    More serious causes of secondary headaches include the following: [11] meningitis: inflammation of the meninges which presents with fever and meningismus, or stiff neck; ischemic stroke or a previous stage of the same; hemorragic stroke or a previous stage of the same; intracranial hemorrhage (bleeding inside the brain) because of any origin