Gastroenteritis with concurrent Ear Infection (Otitis Media): This is a common combination in adolescents, where gastrointestinal symptoms like abdominal pain can occur alongside ear infections, which can cause ear pain and hearing difficulties.

Inflammatory Bowel Disease (IBD) with Ear Involvement: Conditions like Crohn's disease or ulcerative colitis can sometimes be associated with extraintestinal manifestations, including ear symptoms, though this is less common.
Food Poisoning with Secondary Ear Symptoms: Certain types of food poisoning can lead to abdominal pain, and if the condition leads to dehydration or another systemic response, it might exacerbate or trigger ear pain.
Viral Gastroenteritis with Secondary Ear Infection: Similar to gastroenteritis, viral infections can cause abdominal pain and, in some cases, lead to or exacerbate ear infections.

Appendicitis with Referred Ear Pain: Although less common, appendicitis can sometimes present with referred pain to the ear, especially if the appendix is located in a retrocecal position. Missing this diagnosis could lead to severe consequences.
Intussusception: A condition where a part of the intestine slides into an adjacent part, which can cause severe abdominal pain and potentially lead to systemic symptoms, including those that might affect the ears indirectly.
Perforated Viscus: A hole in the wall of the stomach or intestine can lead to severe abdominal pain and peritonitis. While ear pain is not a direct symptom, the systemic infection could potentially affect hearing or cause ear pain.

Ehlers-Danlos Syndrome with Gastrointestinal and Ear Manifestations: A genetic disorder that can affect the body's connective tissue, leading to a variety of symptoms including gastrointestinal issues and potentially ear problems due to the syndrome's effect on collagen.
Autoimmune Disorders (e.g., Lupus) with Gastrointestinal and Ear Involvement: Conditions like systemic lupus erythematosus can cause a wide range of symptoms, including abdominal pain and ear symptoms, though this would be a less common presentation.
Vasculitis (e.g., Henoch-Schönlein Purpura) with Abdominal and Ear Symptoms: A condition that involves inflammation of the blood vessels, which can lead to various symptoms including abdominal pain and potentially ear symptoms, depending on the vessels affected.