What is a transient ischemic attack?

TIA. A transient ischemic attack is caused by the transient blockage of a blood vessel in the brain. Symptoms depend on the blood vessel being blocked. For example, symptoms can include weakness, numbness, confusion, difficulty speaking, changes in vision, dizziness, etc. The seriousness depends on the cause of the blockage (blood clots, atherosclerosis, etc) and the medical problems of the patient.
TIA. Ministroke involves transient symptoms either of facial droop, weakness of extremities, paresthesias, speech disturbance. They usually disappear in a few hours.