Normally, the level of uric acid in the blood does not exceed 420umol/L. When the level of uric acid in the blood exceeds 420umol/L, but there are no symptoms of joint pain, we call it “hyperuricemia”; when it is accompanied by joint swelling and pain (medically called chemical arthritis), we diagnose it as “Gout”. Gout means that chemical arthritis has occurred in large and small joints of the body due to abnormal uric acid metabolism in the body. As you may have noticed, our definition of gout does not say “increased uric acid” but rather “abnormal uric acid metabolism” because chemoarthritis is mainly related to rapid changes in uric acid levels, not just increased uric acid. For example, in some cases, when gout occurs, the uric acid level is normal when a blood test is taken. It may be that the patient’s basal uric acid is low, and after a dramatic increase in uric acid concentration, it still does not reach the average of the high limit of the general population, for example, if it was 200umol/L, it doubles to 400umol/L, but it is a very big change for the patient’s organism, causing arthritis to occur. Some experts have even found that a dramatic drop in uric acid can also cause arthritis.