We analyzed the postoperative modifications of dysmenorrhea in 90 patients with septate or subseptate uterus, but no other genital or pelvic disorders, who underwent metroplasty according to Tompkins (n = 28) or hysteroscopic metroplasty (n = 62). The frequency of dysmenorrhea fell from 50% to 32.1% after the Tompkins' procedure and from 54.8% to 17.7% after hysteroscopic metroplasty. The severity of dysmenorrhea evaluated with two scales, one linear and one multidimensional, showed a significant postoperative decrease in both the groups. In view of the limited cost and low risks of hysteroscopic metroplasty, primary dysmenorrhea associated with septate or subseptate uterus may be considered an indication for this intervention.