When digestive discomfort or potential problems of the esophagus, stomach, liver, colon, or pancreas have you worried or in pain, Hunterdon Gastroenterology Associates (HGA) is here to help. Our medical specialists have been serving patients in Hunterdon County and Central New Jersey with compassion and respect since 1982. Learn More.HGA Physicians‧Contact‧Patient Forms‧Services‧Patient Resources‧Hunterdon Endosurgery Center.