Uric acid above 700μmol/L is defined as elevated uric acid, which is usually caused by drugs, radiotherapy, and kidney disease. 1. Drugs: If patients take drugs such as levodopa, ethambutol, etc., it can make the reabsorption of uric acid in renal tubules be interfered with, which in turn leads to symptoms of elevated uric acid. 2. Radiotherapy: due to the destruction of a large number of cells caused by radiotherapy, resulting in accelerated nucleic acid metabolism, which leads to elevated uric acid. 3. Renal disease: due to glomerulonephritis, renal failure and other renal diseases lead to glomerular filtration rate decrease, uric acid excretion obstacles, which leads to the phenomenon of elevated uric acid. In addition, elevated uric acid may also be caused by hyperuricemia, gout and other diseases, it is recommended that patients go to the regular hospital in a timely manner, clear cause of the disease under the guidance of the doctor to carry out reasonable treatment.