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Objective: To investigate the severity of pain and circadian changes in uterine artery blood flow in primary dysmenorrhea cases., Materials and Methods: The study included 27 cases diagnosed as primary dysmenorrhea and 25 individuals who had no dysmenorrhea complaint. Bilateral uterine artery systole/diastole rates (S/D), pulsatility indices (PI) and resistance indices (RI) of all cases were measured using transvaginal colour Doppler at 12.00-02.00 p.m. and 12.00-02.00 a.m. Severity of pain was evaluated in dysmenorrhea cases at the same hours using a verbal pain assessment scale., Findings: Doppler measurements of dysmenorrhea cases conducted at 12.00-02.00 p.m. showed right uterine artery S/D: 3.37 +/- 0.26, RI: 0.73 +/- 0.07, PI: 2.38 +/- 0.34 and left uterine artery S/D: 3.33 +/- 0.37, RI: 0.74 +/- 0.14, PI: 2.41 +/- 0.15, while measurements carried out at 12.00-02.00 a.m. showed right uterine artery S/D: 3.88 +/- 0.12, RI: 0.87 +/- 0.14, PI: 2.94 +/- 0.21 and left uterine artery S/D: 3.90 +/- 0.27, RI: 0.92 +/- 0.12, PI: 2.93 +/- 0.21. Comparisons revealed significantly higher Doppler indices at night (P < 0.05) than in the day in dysmenorrhea cases. There was not any significant circadian difference in individuals who did not have dysmenorrhea (P > 0.05). Pain score in the verbal pain assessment of dysmenorrhea cases was found 3.6 +/- 1.4 in the day and 5.8 +/- 1.7 at night. The difference was found significant (P < 0.05)., Conclusion: Uterine artery blood flow is reduced at night in dysmenorrhea cases. In correlation with this, the cases feel more pain at night. Our results may be important on the planning of working hours and their quality of life.

Objective: To determine the prevalence of primary dysmenorrhea and attitudes and behavior toward dysmenorrhea in the female students of an university toward this problem., Materials and Methods: A total of 1,266 female university students were anonymously surveyed by doctors., Results: It was found that mean age of the surveyed students was 21.02+/-2.13 years, mean menarche age was 13.3+/-1.4 years, and menstruation frequency was 32.58+/-19.8 days. Of the students, 45.3% were found to suffer pain in each menstruation, 42.5% in some and 12.2% in none. Of those with primary dysmenorrhea, 66.9% were established to take analgesic drugs., Conclusion: Prevalence of primary dysmenorrhea was found higher than that cited in the literature. It was established that although the rate of consultation with health professionals about menstruation and related changes was low, use of agents known to be effective in primary dysmenorrhea treatment was highly common.