Stroke with abnormal side effects

While most people think of weakness as the main symptom of strokes, this is actually misleading. only a very small part of the brain is directly involved with muscle movement and control. This area happens to be close to one of the large arteries that tends to get blood clots, so in turn, weakness IS a common symptom of strokes due to blood clots. On the other hand, MANY strokes occur that due not involve weakness at all.

There is, in fact, a textbook example of a type of stroke that affects part of the brain away from the muscle area called Wiernecke's area. This area is what controls speech production, and if damaged, people will typically talk gibberish without realizing it. They can typically understand others, and know what they want to say, but can only produce random words that have no meaning together.

On the other hand, very large strokes often times trigger a condition called delirium, where people can become terribly confused, disoriented, agitated (or intermittently unconscious) and inattentive. In a certain way, it looks like Alzheimer's disease happening overnight (although it is unrelated).

Either of these sound like possibilities to explain your uncle's behavior, and neither is particularly uncommon.

One of the common risk factors for stroke is high blood pressure. However, it does not always DIRECTLY cause them--sometimes, it simply triggers damage to blood vessels, causing clots in turn. In either case, it is a VERY bad idea to suddenly treat high blood pressure for someone who has had a stroke, because it can permanently kill brain cells that might otherwise have survived. For that reason, high blood pressure is not treated aggressively (or at all in many cases) soon after a stroke.