Symptoms of increased stomach acid when standing and decreased when lying down may be due to gastric ptosis. Patients with gastric ptosis have slower gastric emptying than normal people, and may have symptoms of gastric retention and secondary gastritis, such as epigastric discomfort, fullness, nausea, belching (hiccup), acid reflux, constipation, and fear of food, which are aggravated after eating, prolonged standing, and exertion, and may be alleviated when lying down. At the same time, patients often have symptoms such as weight loss, palpitations, standing hypotension and fainting. Patients with gastric ptosis tend to be long and thin, and the diagnosis can be confirmed by imaging tests. However, gastric ptosis is not the only disease that can lead to an increase in stomach acid when standing up and a decrease in symptoms when lying down. It is recommended to consult a doctor in time to identify the cause of the disease with the help of a professional physician and carry out targeted treatment.