Kuntz nerves are small nerve branches from the sympathetic nerve trunk most commonly arising at or around the T2 level. Sometimes they are present at the T3 and T4 levels as well. They bypass the level they are at and therefore can continue to carry nerve signals past a severed or clamped sympathetic nerve trunk. Kuntz nerves are present in approximately 50% of individuals with one report being as high as 63%. In my experience, Kuntz nerves are present in at least 50% of individuals. I've found as many as seven small Kuntz branches in one patient. If these small nerve branches are not cut where they cross the second rib, then persistet hyperhidrosis and/or Raynauds' symptoms can occur. Return of symptoms after a sympathectomy even can be interpreted as "nerve regeneration or reconnection" several months after surgery.