Low creatinine is considered to be related to decreased protein intake, increased body consumption, drug factors and other causes. 1. Decrease in protein intake: it can be seen in people who are dieting, losing appetite, or whose body weight is lower than normal, etc. The decrease in protein intake leads to a lower than normal creatinine level in the blood. 2. Increased body consumption: for example, malignant tumors, hyperthyroidism, tuberculosis and other patients due to the body is in a chronic state of consumption, resulting in a decrease in blood creatinine. 3. Drug factors: the use of calcium hydroxybenzenesulfonate may cause a false decrease in blood creatinine. When you have a low creatinine, it is recommended that you go to the hospital and ask a professional doctor to make a judgment, and you should not make a blind judgment on your own.