The veteran country singers were slated to kick off their Django and Jimmie Tour in Florence, South Carolina on Thursday (15Oct15), but that gig and others have been rescheduled.

The South Carolina show will now take place in April (16).

Two additional stops in Virginia and Pennsylvania, scheduled for the weekend (ends18Oct15), have also been affected by the 82-year-old star's mystery health issue.

"I have no additional details but it is only the first three dates," a representative for Nelson tells "The rest of the tour is on schedule."

The duo's tour will wrap up with a New Year's Eve (31Dec15) show in Austin, Texas.