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Migraine prodrome phase symptoms. There are four possible phases of a migraine attack: prodrome, aura, attack and post-drome, the Mayo Clinic explains. Not everyone who gets a migraine attack will ...
The aura phase of migraine can occur with or without a headache. Ocular or retinal migraines happen in the eye, so only affect the vision in that eye, while visual migraines occur in the brain, so affect the vision in both eyes together. Visual migraines result from cortical spreading depression and are also commonly termed scintillating scotoma.
Migraine (UK: / ˈ m iː ɡ r eɪ n /, US: / ˈ m aɪ-/) [1] [2] is a genetically-influenced complex neurological disorder characterized by episodes of moderate-to-severe headache, most often unilateral and generally associated with nausea and light and sound sensitivity.
The exact mechanisms which cause migraines, tension headaches and cluster headaches are not known. [28] There have been different hypotheses over time that attempt to explain what happens in the brain to cause these headaches. [29] Migraines are currently thought to be caused by dysfunction of the nerves in the brain. [30]
Migraine headaches are usually characterized by severe pain on one or both sides of the head, an upset stomach, and, for some people, disturbed vision. It is more common in women. While vascular changes are evident during a migraine, the cause of the headache is neurological , not vascular.
The retina lines the inside of the eye. It is light-sensitive and communicates visual messages to the brain. If the retina detaches, it moves and shifts from its normal position. This can cause photopsia, but can also cause permanent vision loss. Medical attention is needed to prevent vision loss.
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