Excessive lactic acid makes body fluids, which are weakly alkaline, acidic, which affects the smooth absorption of nutrients and oxygen by cells, and weakens the normal function of cells. The muscles that accumulate lactic acid will contract, thus squeezing the blood vessels and causing poor blood flow, resulting in muscle aches, chills, headaches, and a feeling of heaviness. Lactic acid buildup causes soreness and lethargy at the beginning, and if left unattended for a long time, it causes acidification of the body and may lead to serious diseases. Diagnosis of lactic acid accumulation in diabetic patients: The key to establishing the diagnosis is to have a high level of vigilance and adequate cognitive ability for the condition. It is worth noting that lactic acidosis can sometimes be accompanied by ketoacidosis and hypertonic non-ketotic hyperglycemic coma, thus increasing the diagnostic complexity. In patients with acidosis in shock, the diagnosis of lactic acidosis can be made without blood lactate measurement, but in patients with acidosis without poor tissue perfusion, blood lactate level must be measured to confirm the diagnosis. 1, Suffering from diabetes mellitus, but most patients are not very hyperglycemic and do not have significant ketoacidosis. 2. A significantly elevated blood lactate level, mostly above 5 mmol/L is the main basis for the diagnosis of lactic acidosis. Blood lactate level is more than normal (>1.8mmol/L), and in 2-5mmol/L, it is mostly compensatory acidosis This kind of only excessive lactate without acidosis can be diagnosed as hyperlactatemia. 3. Evidence of acidosis such as pH <7.35, blood bicarbonate <20mmol/L, anion gap >18mmol/L, etc. Diabetic lactic acidosis can be confirmed if the diagnosis of ketoacidosis such as renal failure can be excluded, combined with a significantly elevated blood lactate level.