Gastrointestinal symptoms are very common worldwide. This study aimed to examine the relationship between gastrointestinal system symptoms, psychological resilience, emotional self-efficacy, and healthy living behaviors in patients. The study was conducted in a training and research hospital in Türkiye with 258 patients who had experienced gastrointestinal symptoms and were scheduled for upper endoscopy and/or colonoscopy. The data were obtained by using an information form, the Brief Resilience Scale, the Emotional Self-Efficacy Scale, the Healthy Lifestyle Behaviors Scale, and the Gastrointestinal Symptom Rating Scale. A statistically positive and significant relationship was found between the Emotional Self-Efficacy Scale and the Healthy Lifestyle Behaviors Scale (r = 0.376; p < .05). It was determined that there was a statistically significant negative relationship between the mean Brief Resilience Scale and the Gastrointestinal Symptom Rating Scale scores (r = −0.150; p < .05). In addition, a positive and significant relationship was found between the mean Brief Resilience Scale and the Emotional Self-Efficacy Scale scores (r = 0.374; p < .05). Psychological factors and healthy living behaviors thus clearly affect gastrointestinal system symptoms. For this reason, it is thought that planning interventions to teach self-management through healthy living behaviors and promoting psychological resilience may reduce gastrointestinal system symptoms.