Functional Dyspepsia: This is the most common cause of belching, often related to swallowing air, eating too quickly, or consuming carbonated drinks. It's a benign condition but can significantly affect quality of life.

Gastroesophageal Reflux Disease (GERD): GERD can cause belching due to the reflux of stomach contents into the esophagus, leading to swallowing of air or regurgitation of food and gas.
Aerophagia: This condition involves swallowing air, which can be due to eating habits, gum chewing, or drinking carbonated beverages, leading to frequent belching.
Irritable Bowel Syndrome (IBS): Although primarily known for causing abdominal pain and changes in bowel movements, some individuals with IBS may experience belching.

Gastric Outlet Obstruction: A condition where the passage of food from the stomach to the small intestine is blocked, which can lead to severe vomiting and belching. It's crucial to diagnose and treat promptly to avoid complications.
Peptic Ulcer Disease: While more commonly associated with abdominal pain, peptic ulcers can cause belching, especially if they lead to gastric outlet obstruction or significant inflammation.
Gastric Cancer: Although rare, gastric cancer can present with non-specific symptoms including belching, especially if the tumor obstructs the gastric outlet or causes significant gastric distension.

Rumination Syndrome: A condition where food is regurgitated into the mouth, often without nausea or vomiting, and then chewed and swallowed again, which can lead to belching.
Eosinophilic Esophagitis: An inflammatory condition of the esophagus that can cause difficulty swallowing, food impaction, and potentially belching, though it's more commonly associated with dysphagia.
Gastroparesis: A condition where the stomach takes too long to empty its contents, which can lead to bloating, nausea, vomiting, and occasionally belching, especially if there's associated gastroesophageal reflux.