What happens when the penis can't get hard during sex

Do sex if hard up, this situation is considered more impotence symptoms. Cause impotence more reasons, it is best to do the relevant examination to the local male specialist hospital, such as penile erection experiment. In addition, can be found through color Doppler ultrasound examination of the blood flow in the deep artery of the penis is abnormal. If the blood flow velocity of the deep artery of the penis is less than 25 cm per second, this situation is considered arterial impotence. If the penile deep artery blood flow velocity is higher than 5cm per second, this situation should be considered as venous impotence, and then targeted treatment according to the results of the examination. If the impotence symptoms caused by kidney deficiency, you need to take kidney, yang Chinese medicine to condition under the guidance of Chinese medicine doctors, so that you can alleviate the symptoms of penis hard up.