Lower limb soreness and weakness is a symptom of kidney deficiency, but other diseases can also cause lower limb soreness and weakness. Prompt medical treatment is recommended. Kidney deficiency is a collective term for kidney yang deficiency, kidney yin deficiency and so on. Kidney deficiency can lead to lower limb soreness and weakness, and can also be manifested as premature aging, forgetfulness, lumbar and knee soreness and weakness (the feeling of soreness and weakness of the waist and knees), fatigue, reduced sexual function, and poor mood. The clinical manifestations of different syndromes have their own characteristics. Patients with kidney yang deficiency can also be accompanied by dizziness, pale or grayish-black face, coldness of the whole body (most obvious in the lower limbs), mental depression, etc. Patients with kidney yin deficiency can also be accompanied by looseness of teeth and hair loss, dizziness and tinnitus, heart heat (heat in the hearts of the two hands and feet, and self-consciousness of the heart and chest), hot flashes (a burst of heat), zygomatic redness (reddish color of the cheeks and zygomatic bone), etc. If you have symptoms of lower limb acidity and weakness, it is recommended that you seek timely medical attention to identify the cause and carry out targeted treatment.