Orchalgia is chronic pain of the testicles or scrotum that typically lasts for more than three months. Orchalgia may be caused by injury, surgery, cancer or testicular torsion. About one out of every 1,000 vasectomy patients are afflicted with orchalgia. The testicles, or testes (singular testis), are the male generative glands in animals. ... In some male mammals, the scrotum is a bag of skin and muscle containing the testicles. ... Injury is damage or harm caused to the structure or function of the body caused by an outside agent or force, which may be physical or chemical. ... A cardiothoracic surgeon performs a mitral valve replacement at the Fitzsimons Army Medical Center. ... Cancer is a class of diseases or disorders characterized by uncontrolled division of cells and the ability of these cells to invade other tissues, either by direct growth into adjacent tissue through invasion or by implantation into distant sites by metastasis. ... In testicular torsion the spermatic cord that provides the blood supply to a testicle is twisted, cutting off the blood supply, often causing orchalgia. ... Vasectomy is a birth control method in which all or part of the vasa deferentia are surgically removed, thus sterilizing the patient. ...