Why am i experiencing unending hiccups after arthroscopic shoulder surgery?

Nerve irritation: Peripheral nerve blocks are commonly done for post-operative pain control in arthroscopic shoulder surgery. Sometimes the phrenic nerve can become irritated and produce hiccups. The phrenic nerve innervates the diaphragm and is located in the neck, close to the nerves that go down the arm. These symptoms should go away on their own, if not contact your shoulder surgeon.