Whether triglycerides 5.1mmol/L is serious or not should be seen in conjunction with other indicators. An occasional Triglycerides 5.1mmol/L is not particularly serious. However, if the triglyceride level is high for a long period of time, and at the same time other lipid components, such as cholesterol and LDL, are also high, it is more serious. Triglycerides are mainly closely related to diet. If the triglyceride level is 5.1mmol/L once in a while, it is very likely to be due to eating too much greasy food recently, so you can control your diet first and review it after adjustment. If the triglyceride level of 5.1mmol/L is accompanied by significant elevation of cholesterol, LDL and other indicators, especially if it lasts for a longer period of time and cannot return to normal, then it should be considered as relatively more serious, and it is usually necessary to visit the hospital for evaluation, in addition to dietary and lifestyle interventions. If elevated triglycerides are detected, it is recommended to visit the hospital in time for treatment under the guidance of a doctor.