"post-infective, e.g. after acute epididymitis"
"post-vasectomy pain syndrome"
"syndromic, e.g. Behcet's disease"
"chronic epidymyalgia: mass/swelling absent; cause unknown"
"Initial treatment consists of a trial of antibiotics as well as scrotal support, anti-inflammatories, and analgesia including nerve blocks. Chronic epididymitis is generally considered "self-limited" albeit with a chronic course; refractory cases may require surgical resection of the epididymis 5."