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The headache is classically a morning headache that may wake the person up. The brain is relatively poorly supplied by oxygen as a result of mild hypoventilation during the sleeping hours leading to hypercapnia and vasodilation. Cerebral edema may worsen during the night due to the lying position. The headache is worse on coughing, sneezing, or ...
Acephalgic migraine (also called migraine aura without headache, amigrainous migraine, isolated visual migraine, and optical migraine) is a neurological syndrome.It is a relatively uncommon variant of migraine in which the patient may experience some migraine symptoms such as aura, nausea, photophobia, and hemiparesis, but does not experience headache. [1]
Sneezing typically occurs when foreign particles or sufficient external stimulants pass through the nasal hairs to reach the nasal mucosa.This triggers the release of histamines, which irritate the nerve cells in the nose, resulting in signals being sent to the brain to initiate the sneeze through the trigeminal nerve network.
Someone who has worsening cough, persistent high fevers and other concerning symptoms like chest pain, abdominal pain and trouble catching their breath needs to seek medical care to treat these ...
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Migraine is believed to be caused by a mixture of environmental and genetic factors that influence the excitation and inhibition of nerve cells in the brain. [8] An incomplete "vascular hypothesis" postulated that the aura of migraine is produced by vasoconstriction and the headache of migraine is produced by vasodilation.
These weather changes may trigger a migraine by disrupting the balance of chemicals in the brain, like serotonin, according to the Mayo Clinic. Weather-related triggers include bright sunlight ...
Once stimulated, a nociceptor sends a message up the length of the nerve fibre to the nerve cells in the brain, signalling that a part of the body hurts. [27] Primary headaches are more difficult to understand than secondary headaches. The exact mechanisms which cause migraines, tension headaches and cluster headaches are not known. [28]
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