Even though a person does not experience high triglyceride symptoms, the effects of high triglycerides over long periods of time can be life-threatening. Therefore, it is important to get your triglyceride and cholesterol levels tested so that you know your numbers. Lowering triglyceride levels that are too high lessens the risk for developing heart disease. It also reduces your risk of having a heart attack or dying of heart disease, even if you already have it.