Hello: Astragalus membranaceus is a qi-invigorating medicine, which has the effects of invigorating qi and yang, invigorating qi and consolidating exterior, supporting toxin and promoting granulation, inducing diuresis and reducing swelling; Angelica sinensis has the functions of enriching blood and activating blood, regulating menstruation and relieving pain, moistening intestines and relaxing bowels; Polygonatum sibiricum nourishes yin, moistens lung, tonifies spleen and benefits qi; Red dates tonify the spleen and stomach, nourish the heart and soothe the nerves, and ease the medicinal properties; Lycium barbarum nourishes the liver and kidney, benefiting the eyes; Black-bone chicken belongs to warming and tonifying qi and blood; The above drugs have the effects of regulating qi and blood, tonifying liver and kidney, and should have the effect of treating low back pain after eating; Low back pain and frequent urination. I suggest you go to the hospital to find out the cause.