This paper examines the intricate relationship between Obsessive-Compulsive Disorder (OCD) and eating disorders (EDs), focusing on their diagnostic criteria, comorbidity, shared characteristics, and the profound medical and psychiatric complications that arise from these conditions. OCD is characterized by intrusive obsessions and compulsions that significantly impact daily functioning, while EDs, including Anorexia Nervosa, Bulimia Nervosa, and Binge-Eating Disorder, involve severe disturbances in eating behaviors and body image. These disorders often co-occur, with up to 41% of individuals with EDs also suffering from OCD. The shared symptoms, such as obsessions, compulsions, avoidance behaviors, and perfectionism, highlight the complex interplay between OCD and EDs, complicating diagnosis and treatment. The medical complications associated with this comorbidity are severe and varied, affecting multiple organ systems. Gastrointestinal issues, proctological problems, oral health deterioration, cardiological dysfunction, electrolyte imbalances, kidney disorders, and hormonal dysregulation are common. Additionally, sleep disorders are prevalent, further exacerbating both psychiatric and physical health outcomes. Effective treatment requires a holistic approach that addresses the unique needs of each individual, with integrated care involving specialists across medical and mental health fields. This comprehensive approach is crucial to mitigating the devastating impact of OCD and EDs, improving overall well-being and quality of life for affected individuals.