| Allergic eosinophilic esophagitis | Most commonly diagnosed in neonates and infants, but can affect older children and adults | Emesis, dysphagia, or epigastric pain that continues despite antireflux therapy |
| Normal esophageal pH |
| Allergic eosinophilic gastritis | Children and adolescents | Failure to thrive, diarrhea, emesis, epigastric pain, occult blood in stool, gastric outlet obstruction |
| Allergic proctocolitis | Usually in young infants; more than 50 percent are exclusively breastfed | Can occasionally produce blood-streaked stools |
| Sometimes occurs in older children |