Is foaming at the mouth a symptom of sleep apnea?

No, foaming at the mouth during sleep is not generally considered a direct symptom of sleep apnea. Although sleep apnea can cause various abnormalities and health problems, foaming at the mouth is typically associated with other medical conditions or factors, such as seizures or certain neurological disorders. If you or someone you know is experiencing foaming at the mouth during sleep, it's important to seek professional medical advice and evaluation to determine the underlying cause.