I have experienced several bouts of hiccups that go on for several weeks to months with no relief. I have had all of the normal tests to determine a cause, but no cause has been identified. I also have other stomach problems. What causes intractable hiccups? What tests may be conducted to determine the underlying cause of intractable hiccups? Can intractable hiccups be related to other stomach problems? How might intractable hiccups be treated?