Background and Purpose: Hie-symptom is more common in women, with complains of strong cold sensation of fingers and lower limbs during cold weather. From the cyanotic findings of hands and thighs and dark venous blood, blood stasis due to excessive peripheral vein contraction was suspected. Then we studied the changes of sublingual and body surface temperature, venous gas partial pressure in the warm and cold conditions. To examine the role of thermo-dilating effects of nitric oxide (NO), the effects oral administration PDE 5 inhibitor Tadarafil (TDF) were also studied.   Subjects and Methods: The subjects were 10 women (31 +- 8.8 yrs) with Hie-symptom and 7 women (26+-3.7 yrs) without Hie-symptom, BMI, blood pressure, heart rate,sublingual and peripheral body surface temperature (hand and lower limb), venous and arterial blood gas partial pressure, and fingertip arterial oxygen saturation were measured. The measurement was carried out at warm indoors (about 23°C) and cold outdoors (about 12°C). Then 10 mg TDF tablet was taken and all measurements were repeated again at the same time on the next day.   Results: There was no difference in fingertip arterial blood oxygen saturation in both groups either at indoor or outdoor conditions, and even after taking TDF. In the cold outdoor, the subjects with Hie-symptom, compared to without Hie-symptom, showed significantly lower body surface temperature and venous blood pO2, and increased pCO2. After taking TDF, although sublingual temperature and the decrease in body surface temperature outside the room improved in both groups, the improvement was greater in Hie-symptom.  Consideration and Conclusion: Because of normal fingertip arterial blood oxygen saturation, Hie-symptom is not considered to be a disorder of the cardiopulmonary/arterial system. From a significant decrease in peripheral body surface temperature, and peripheral venous blood pO2, and an increase in pCO2 of Hie-symptom in cold outdoors, it is considered that blood stasis by excessive constriction of peripheral veins or arteriovenous anastomosis (AVA) by the cold. The better effects of oral TDF, in Hie-symptom seems to predict the involvement of NO or cGMP in blood stasis.