Autonomic neuropathy occurs when the nerves that control the body's automatic functions are damaged. Diabetes is the most common cause of autonomic neuropathy, but other causes include other diseases, infections, and certain medications. Symptoms and treatment of this condition depend on the type of nerve damage.

The Valsalva maneuver is named after Italian physician Antonio Maria Valsalva. It is a breathing technique that can be used to help diagnose problems with the autonomic nervous system or problems with heart rhythm recovery.