It is the passage of contents from the stomach into the oesophagus.
It is caused due to the lower oesophageal sphincter failing to close properly. Between the factors that prompt its appearance, the existence of a hiatal hernia, certain foods, adopting a horizontal position after eating, pressure in the abdomen and some medications are included.
It causes a burning or acidic sensation in the chest and throat, often leaving an acidic or bitter taste known as pyrosis when reflux reaches the mouth.
The diagnosis is reached through reviewing the patient's medical history and a complete physical examination. It is confirmed through tests that measure the acidity of the gastrointestinal tract.
Treatment is based on avoiding the causes and reducing the amount of gastric acid by means of medication (gastric protectors).
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