HealthPhoto: HT HealthDoctor Explains Causes of Sour Taste in Mouth Upon Waking
Dr. Saurabh Bansal, a gastrointestinal surgeon, explains that waking up with a sour taste in the mouth is often due to nighttime acid reflux. This occurs when stomach contents flow back into the esophagus, especially if dinner is eaten close to bedtime and one lies down soon after. Gravity helps keep stomach contents down when upright, but this effect lessens when lying flat during sleep.
HT Health·



