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Transient ischemic attack (TIA) A temporary impairment of the brain caused by an insufficient supply of blood, which can result in brief memory or speech problems, weakness, paralysis, dizziness, or nausea. Episodes usually last for a few minutes, but they may occur for up to a few hours. An attack that lasts for more than 24 hours is considered to be a stroke. unlike a stroke, which may have the same symptoms but involve a lasting deficit, TIA symptoms fade without permanent damage. However,...