①Kidney yin deficiency:

Symptoms: lumbar and knee soreness / tinnitus / vision loss / wetness (semen) / hot flashes and night sweats (sweating in the sleep) / heartburn and heat / dry mouth, but do not want to drink / dry eyes and cheekbones / dizziness and dizziness / red tongue, no moss or stripped of moss / women amenorrhea and infertility / men with little sperm, infertility.

②Kidney yang deficiency:

Symptoms: cold limbs / cold hands and feet / whitish or dark / lumbar spine pain / cold knees / weakness / loss of libido / impotence and premature ejaculation / urinary edema / loose food / tongue moss / tongue pale fat tender. The above is the difference, the two symptoms are not the same, but in real life there is rarely a single yin or yang deficiency, most of the yin and yang are weak, which is a different proportion of light and heavy.