Bilateral small kidney crystals may cause hematuria, because small bilateral crystals can be easily discharged into the bladder through the ureter and out of the urethra, which may cause local mucosal friction in the process of discharge, and then can cause local mucosal oozing of blood and manifest as hematuria. Sometimes the discharge process can be accompanied by transient lumbar pain and abdominal pain, and if the mucous membrane breaks down and bleeds, it is easier to combine urinary tract infection, which can aggravate the hematuria. If you have bilateral small crystals, you need to drink a lot of water every day, and it is recommended to drink more than 2000mL. At the same time, you need to assist more exercise, which can promote the timely discharge of small crystals on both sides.