Cerebral natriuretic peptide (CNP) is an active substance secreted by cardiac myocytes. Low cardiac load leads to lower than normal CNP levels, which is not particularly harmful and is not a cause for undue stress. Brain natriuretic peptide is synthesized and secreted by ventricular myocytes. The level of brain natriuretic peptide generally varies with the tension of the ventricular wall, and an increase in ventricular load will lead to a change in the tension of the ventricular wall, which will stimulate the secretion of brain natriuretic peptide. Brain natriuretic peptide levels are mainly used to diagnose cardiac insufficiency, and the level will be increased in cardiac insufficiency, while other indicators such as chronic kidney disease and pulmonary embolism may also be increased. Lower than normal brain natriuretic peptide levels have little effect on the human body and are a good sign that the chances of heart failure are very small, or if you have previously suffered from heart failure, a lower than normal brain natriuretic peptide level indicates that the heart function has recovered well. If you feel unwell, you should go to the hospital in time, do not diagnose yourself blindly, so as not to delay the condition.