When contacted about Hurst's situation, a UNC official was unable to comment.
According to the sources, Hurst is suffering from serious back problems.
The Plainfield, Ind. native recorded 11 receptions for 160 yards and a touchdown during the 2011 season.
Hurst, whose brother is starting offensive lineman James Hurst, transferred to UNC from Mississippi State in 2009.
CHAPEL HILL, N.C. --- Senior tight end Nelson Hurst will receive a career-ending medical hardship, according to multiple sources close to the situation.
Medical Hardship for N. Hurst
Injury ends career for senior tight end.