Kidney yin deficiency and kidney yang deficiency can both cause male erection failure. Among them, when there is deficiency of kidney yin and lack of yin and fluid, the phenomenon of yin deficiency and internal heat will easily occur, resulting in loss of yin and essence, and inability of the penis to become erect. And when there is deficiency of kidney yang (lack of yang qi in the kidneys), yang qi has no way to be transformed and cannot moisten the penis, resulting in impotence and weakness of the penis, or it is not strong enough to be erected. The exact cause of the problem should be determined by other accompanying symptoms. 1. Kidney yin deficiency: Kidney yin deficiency is often accompanied by heat in the hands and feet, dry mouth and thirst, spontaneous sweating and night sweating (sweating abnormally after going to sleep, and sweating stops after waking up), and a red tongue with little moss, etc. You need to take medicines to nourish the kidney yin under the guidance of a doctor, such as Zuo Gui Wan and Daxin Yin Pill to take oral medicines; 2. Kidney yang deficiency: patients with kidney yang deficiency may be accompanied by symptoms such as fear of cold limbs (fear of cold, cold limbs), thin and cold semen, cold scrotum and penis, fatigue (mental fatigue, physical fatigue), loss of appetite, thin pulse, decreased libido, etc., which can be treated with oral medicines to warm up the kidneys and strengthen yang, for example, Right Angelica Pill with Zanyu Dan. It should be noted that both men with kidney yin deficiency and men with kidney yang deficiency are not recommended to take medication on their own, and should take medication under the guidance of a regular doctor to avoid the symptoms worsening due to incorrect medication. During the treatment period, pay attention to avoid eating spicy and stimulating food, to avoid the effect of the medicine.