Disorders of gastric and duodenal motility are major contributors to upper abdominal symptoms. Impaired adaptive relaxation of the stomach frequently results in early satiety, whereas both delayed and accelerated gastric emptying have been linked to symptom development. A clear understanding of these mechanisms is essential for selecting appropriate treatment, and objective assessments of gastrointestinal motility can provide valuable insights into underlying pathophysiology. However, routine use of such tests is not recommended in daily practice, since specialized equipment is not always available, and functional gastrointestinal disorders are multifactorial, influenced by factors beyond motility alone. Accordingly, current guidelines advocate a selective rather than universal approach to testing. Nevertheless, gastric emptying studies remain clinically useful because they allow detection of impaired accommodation or abnormal emptying patterns. These findings may inform therapeutic choices and support individualized management. Thus, motility tests should be performed selectively, guided by a patient’s symptoms and clinical course, rather than applied indiscriminately.