Drinking coffee immediately upon waking is a daily habit for many, leading to questions about its digestive impact. Scientific evidence indicates that while this practice is not universally harmful, it may exacerbate symptoms for some individuals. Caffeine and other compounds can stimulate gastric acid secretion and affect the muscle that prevents reflux into the esophagus. A study analyzing data from over 122,000 people across 40 research projects found only a limited link between coffee consumption and gastroesophageal reflux disease, concluding that coffee is not necessarily a direct cause for everyone. The Cleveland Clinic reports that individual tolerance varies based on existing digestive health. Experts suggest that those experiencing discomfort should consider reducing their intake or drinking coffee after a light snack, and strongly advise consulting a doctor if heartburn or reflux symptoms continue.