what is the cause of slurred speech
1 Muscle tension can make it harder to move mouth muscles, which of course is the main cause of slurred speech in most other conditions.  Over-Awareness An interesting problem with anxiety is the way it makes you over-aware of what would otherwise be subconscious/automatic behaviors.
Slurred speech is an example of an anxiety symptom that can be incredibly frightening. But it's common with those suffering from anxiety attacks, and in most cases it says nothing about the health of your brain. Anxiety attacks can cause a host of issues that may lead to slurred speech.