The effect of excessive stress can be show in both physical and psychological changes in a person. Hence, slurred speech is a distinct medical issue and not a result of stress, called dysathria.
Conditions such as Insomnia, heart attack are complications which may result from overworking the body system. Often, individuals with certain medical conditions are advised to steer clear of stress.
Similarly, psychological effects of stress can be felt through unnecessary anger and hostility. Depression may also result, which can lead to excessive consumption of alcohol.
Therefore, slurred speech is a defect where clear pronunciation of words cannot be made and it isn't caused by excessive stress.
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