Which of the following is NOT a common cause of a TIA?

A transient ischemic attack (TIA) occurs when there is a temporary decrease in blood flow to a part of the brain, leading to symptoms similar to those of a stroke but lasting only a short time, typically less than 24 hours. The most common causes of TIAs involve conditions that affect blood flow.

Advanced atherosclerotic disease can lead to TIAs due to the buildup of plaque in the arteries, which narrows them and restricts blood flow to the brain. High blood pressure is also a significant risk factor, as it can damage blood vessels and promote the development of conditions like atherosclerosis that can lead to TIAs. Cardiovascular anomalies, which encompass a range of structural heart problems that can impede normal blood flow or contribute to embolism, can also trigger TIAs through similar mechanisms.

In contrast, excessive hydration is not recognized as a common cause of TIAs. While hydration is crucial for overall health, it does not typically influence the vascular conditions that lead to TIAs. Understanding these distinctions helps clarify why excessive hydration does not contribute to the risk factors associated with TIAs.