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The development of unexplained thrombophlebitis and puzzling systemic disorders within one to several years after elective vasectomy is reported. The systemic features included prolonged fever, generalized lymph node enlargement, various skin eruptions, arthropathy, recurrent infections, glomerulonephritis, interstitial pulmonary fibrosis, neuropsychiatric features, increased BSP retention, an elevated level of circulating globulins, and a biologic false‐positive serologic reaction. The frequency of concomitant severe reactive hypoglycemia due to diabetogenic hyperinsulinism in these patients also was noteworthy. The possible pathogenetic mechanisms are discussed, including induced hormonal imbalances, autosensitization to testicular nucleoproteins, and altered blood coagulation in the hyperinsulinized‐diabetic state.