Though a gastroesophageal hernia is dangerous, an incarcerated hernia is a medical emergency that requires immediate treatment. This type possesses all the symptoms of a paraesophageal hiatal hernia and further restricts the flow of blood. Minor side effects include an inability to belch and dysphagia. More severe issues soon follow, such as vomiting that may progress to retching, black stools, and vomiting blood. In extreme incarcerated hernias, a hole may develop in the side of the stomach. This gastric perforation can lead to various issues including severe stomach pain, fever, nausea, and dizziness.

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