Hiatal hernia is a condition in which a portion of the stomach pushes through the diaphragm and into the chest cavity. It can cause symptoms such as heartburn, chest pain, and difficulty swallowing. Synonyms for hiatal hernia include diaphragmatic hernia, hiatus hernia, and paraesophageal hernia. These terms all refer to the same condition, with subtle differences in the location and severity of the hernia. It is important for individuals experiencing symptoms of hiatal hernia to seek medical attention, as untreated cases can lead to complications such as gastroesophageal reflux disease (GERD) and esophageal bleeding.