Examples
An aura sensation can include one or a combination of the following:

Visual changes
Bright lights and blobs
Zigzag lines
Distortions in the size or shape of objects
Vibrating visual field
Scintillating scotomaShimmering, pulsating patches, often curved
Tunnel vision
ScotomaBlind or dark spots
Curtain like effect over one eye
Slowly spreading spots
Kaleidoscope effects
Temporary blindness in one or both eyes
Heightened sensitivity to light

Auditory changes
Hearing voices or sounds that do not exist: auditory hallucinations
Modification of voices or sounds in the environment: buzzing, tremolo, amplitude modulation or other modulations
Heightened sensitivity to hearing
Vestibular dysfunction causing vertigo

Other sensations
Strange smells (phantosmia) or tastes (gustatory hallucinations)
Heightened sensitivity to smell
Synesthesia
Déjà vu or jamais vu
Cephalic aura, a perception of movement of the head or inside the head
Abdominal aura, such as an epigastric rising sensation
Nausea
A sudden feeling of anxiety, fear, or foreboding
Numbness or tingling (paresthesia)
Weakness on one side of the body (hemiparesis)
Feelings of being separated from or floating above ones body (dissociation)
Sensation of limbs or teeth growing
Feeling of overheating and sudden perspiration
Inability to speak (aphasia) or slurred speech

See also
Focal seizure – Epilepsy syndrome characterised by seizures preceded by isolated disturbances of a cerebral function
Hallucination – Perception in the absence of external stimulation that has the qualities of real perception
Persistent aura without infarction
Synesthesia – Neurological condition involving the crossing of senses
CADASIL
Retinal migraine
Photopsia – Presence of perceived flashes of light in ones field of vision

References


== External links ==
Sulfhemoglobinemia  is a rare condition in which there is excess sulfhemoglobin (SulfHb) in the blood. The pigment is a greenish derivative of hemoglobin which cannot be converted back to normal, functional hemoglobin. It causes cyanosis even at low blood levels. It is a rare blood condition in which the β-pyrrole ring of the hemoglobin molecule has the ability to bind irreversibly to any substance containing a sulfur atom. When hydrogen sulfide (H2S) (or sulfide ions) and ferrous ions combine in the heme of hemoglobin, the blood is thus incapable of transport oxygen to the tissues. Presentation
Symptoms include a blueish or greenish coloration of the blood (cyanosis), skin, and mucous membranes, even though a blood count test may not show any abnormalities in the blood. This discoloration is caused by greater than 5 grams per cent of deoxyhemoglobin, or 1.5 grams per cent of methemoglobin, or 0.5 grams per cent of sulfhemoglobin, all serious medical abnormalities. Causes
Sulfhemoglobinemia is usually drug induced, with drugs associated with it including sulphonamides, such as sulfasalazine or sumatriptan. Another possible cause is occupational exposure to sulfur compounds.It can also be caused by phenazopyridine. Treatment
The condition generally resolves itself with erythrocyte (red blood cell) turnover, although blood transfusions can be necessary in extreme cases. Notable cases
On June 8, 2007, Canadian anesthesiologists Dr. Stephan Schwarz, Dr. Giuseppe Del Vicario, and Dr. Alana Flexman presented an unusual case in The Lancet.