Functional Dyspepsia: This condition is characterized by recurrent abdominal pain or discomfort in the upper abdomen that is often related to eating. It's a common cause of abdominal pain in adolescents and can be exacerbated by stress, certain foods, or eating habits.

Irritable Bowel Syndrome (IBS): Although IBS typically presents with a combination of abdominal pain and changes in bowel habits, some patients may experience pain after eating. The diagnosis is based on symptom criteria (Rome IV) and the absence of alarm features.
Gastroesophageal Reflux Disease (GERD): GERD can cause abdominal pain or discomfort, especially after eating, due to the reflux of stomach contents into the esophagus. It's more common in individuals who are overweight or have a family history of GERD.
Food Intolerance: Intolerance to certain foods (e.g., lactose, gluten) can lead to abdominal pain, bloating, and other gastrointestinal symptoms after consumption. Common culprits include dairy products, gluten, and high-FODMAP foods.

Appendicitis: Although less common, appendicitis can present with abdominal pain that initially may be diffuse or around the navel and later localizes to the right lower quadrant. It's crucial to consider appendicitis, especially if the pain is severe, persistent, or accompanied by fever, vomiting, or rebound tenderness.
Inflammatory Bowel Disease (IBD): Conditions like Crohn's disease and ulcerative colitis can cause chronic abdominal pain, diarrhea, weight loss, and other systemic symptoms. While less common in adolescents, IBD can have a significant impact on quality of life and requires early diagnosis and treatment.
Peptic Ulcer Disease: Peptic ulcers can cause epigastric pain that worsens with eating, especially if the ulcer is located in the duodenum. The presence of Helicobacter pylori infection or the use of nonsteroidal anti-inflammatory drugs (NSAIDs) increases the risk.

Eosinophilic Gastroenteritis: A rare condition characterized by the infiltration of eosinophils into the gastrointestinal wall, leading to abdominal pain, nausea, vomiting, and diarrhea. Food allergy or intolerance often plays a role.
Gastric Volvulus: A rare condition where the stomach twists abnormally, leading to severe abdominal pain, nausea, and vomiting. It may be associated with eating or occur spontaneously.
Intestinal Obstruction: Although rare in the absence of previous abdominal surgery or other predisposing factors, intestinal obstruction can cause severe abdominal pain, vomiting, and constipation. It's a medical emergency requiring prompt diagnosis and treatment.