Delayed pressure urticaria (DPU) is characterized by swelling in the area of sustained pressure on the skin. The reported case was a potentially life-threatening complication due to mucosal edema following esophagogastroduodenoscopy (EGD). A 37-year-old man, suffering from severe DPU and chronic spontaneous urticaria, had undergone EGD due to dyspeptic symptoms. A few hours after the EGD procedure, the patient showed both dysphagia and dyspnea. A physical examination indicated massive tongue base and pharynx edema. We suggest that these symptoms were most likely due to the pressure exerted by EGD. No other apparent origins such as angioedema or late-phase allergic reaction to drugs were identified. One should be aware of the increased risk of developing airway and gastrointestinal obstruction during medical procedures associated with compression, such as EGD or endotracheal intubation, in DPU patients.