TIAs are small, reversible strokes. When blood flow is temporarily insufficient for part of the brain, the brain tissue will not function properly. The changes that the patient experiences are real but reversible. The affected part of the brain loses function while the blood flow is insufficient, but it does not die, which would cause permanent loss of function. The variety of symptoms produced by TIAs is large and may involve sensory or motor functions, or both. Occasionally the symptoms may be so mild and transient that they are ignored by the patient and family alike.