Upper GI surgeries include surgeries for the following condition :

Gastro Esophageal Reflux Disease (GERD) The esophagus carries food from the mouth to the stomach. The lower oesophageal sphincter is a ring of muscle at the bottom of the esophagus that acts like a valve between the esophagus and stomach.

Gastro Esophageal Reflux Disease, or GERD, is a chronic disease that occurs when the lower oesophageal sphincter does not close properly and stomach contents leak back, or reflux, into the esophagus.

Obesity
Obesity is a serious, chronic disease and not a simple condition. Obesity is defined as an excessively high amount of body fat in relation to lean body mass. Obesity is the second leading cause of preventable death following smoking. Over the years, weight-loss surgery has proven to be a successful method for the treatment of morbid obesity. Surgical treatment option includes :

Infections & Inflammations An infection is the condition of multiplication of parasitic organisms or microorganisms within the body. An inflammation is the reactions that occur in the affected blood vessels and adjacent tissues in response to an injury or abnormal stimulation caused by a physical, chemical, or biologic agent. Many people use the terms interchangeably since they have several symptoms in common and usually are treated similarly.

Stomach & Esophagus
The esophagus is the muscular tube that leads from the mouth to the stomach. Swallowed food is massaged down the oesophagus and passed through a weak ring of muscle (sphincter) into the stomach.

The following conditions of Esophagus and stomach are treated by Dr. Mahendra Bhavsar :

Esophagus:

Stomach

Intestine