Small crystals in the kidneys may further form kidney stones. Small crystals alone usually do not have much effect, and it is suggested that they can be improved by drinking moderate amount of water, and if necessary, improve the relevant examination to detect kidney-related diseases. Kidney crystals generally refer to high-density calcified spots, which are the precipitation of calcium and phosphate salts in the urine after filtration and reabsorption by the kidneys, and most of them are related to low water intake and metabolic diseases. If metabolic diseases are present, resulting in concentrated urine or increased levels of calcium substances, they will gradually concentrate and form small crystals. If there are small crystals in the kidneys, the concentration of small crystals in the urine can be diluted by drinking more water in moderation to increase the volume of urine, so as to reduce the deposition of crystals as well as preventing the crystals from continuing to increase in size, in order to avoid over-concentration of urine, which will further lead to an increase in the size of crystals and the formation of kidney stones. Kidney stones usually cause symptoms such as lumbar and abdominal cramps, nausea, vomiting, irritability, abdominal distension, hematuria, etc. They can also cause urinary tract infections, chills, fever and other symptoms, and in severe cases, can also cause kidney failure. If there are small crystals on the kidneys, it is recommended to go to the hospital in a timely manner, under the guidance of the doctor to actively standardize the diagnosis and treatment, so as not to delay the condition.