Medical Health Encyclopedia

Auras. Auras are sensory disturbances that occur before the migraine attack in between 20% and 25% of patients. Visually, auras are referred to as being positive or negative:

• Positive auras include bright or shimmering light or shapes at the edge of their field of vision called scintillating scotoma. They can enlarge and fill the line of vision. Other positive aura experiences are zigzag lines or stars.
• Negative auras are dark holes, blind spots, or tunnel vision (inability to see to the side).

Patients may have mixed positive and negative auras. This is a visual experience that is sometimes described as a fortress with sharp angles around a dark center.

Other neurologic symptoms may occur at the same time as the aura, although they are less common. They include the following:

• Speech disturbances.
• Tingling, numbness, or weakness in an arm or leg.
• Perceptual disturbances such as space or size distortions.
• Confusion.

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Migraine Attack. If untreated, attacks usually last from four to 72 hours. A typical migraine attack produces the following symptoms:

• Throbbing pain on one side of the head. The word migraine, in fact, is derived from the Greek word hemikrania, meaning "half of the head" because the pain of migraine often occurs on one side. Pain also sometimes spreads to affect the entire head.
• Pain worsened by physical activity.
• Nausea, sometimes with vomiting.
• Visual symptoms.
• Facial tingling or numbness.
• Extreme sensitivity to light and noise.
• Looking pale and feeling cold.
• Less common symptoms include tearing and redness in one eye, swelling of the eyelid, and nasal congestion, including runny nose. (Such symptoms are more common in certain other headaches, notably cluster headaches. In one study, however, they occurred in over 40% of migraine sufferers.)