Triglyceride levels measure the amount of the most common type of fat in your blood, reported in milligrams per deciliter (mg/dL). A normal level for adults is below 150 mg/dL. Your body uses triglycerides as its primary form of energy storage, but when levels climb too high, they contribute to artery disease and, at extreme levels, can trigger a painful inflammation of the pancreas.
What Triglycerides Actually Do
Triglycerides are molecules made of three fatty acids attached to a small backbone of glycerol. They are the main way your body stores energy for later use. When you eat more calories than you need right away, your liver and fat tissue convert the excess into triglycerides and tuck them into fat cells and muscle. Between meals or during exercise, your body breaks those triglycerides back down into fatty acids and burns them for fuel.
This system is essential for survival. The problem starts when more triglycerides are being made than your body can use or clear from the bloodstream. That surplus circulates in particles that can damage blood vessels over time.
Normal, Borderline, and High Ranges
Triglyceride results fall into four categories:
- Normal: Below 150 mg/dL
- Mild (borderline high): 150 to 199 mg/dL
- Moderate (high): 200 to 499 mg/dL
- Severe (very high): 500 mg/dL or above
These numbers come from a standard lipid panel blood test, which also reports your total cholesterol, LDL, and HDL. You’ll typically need to fast for 9 to 12 hours before the draw so that a recent meal doesn’t temporarily inflate the reading. Your provider will tell you whether fasting is required.
Your triglyceride number also gives a rough estimate of another value on your lipid panel. VLDL cholesterol, a type of “bad” cholesterol that carries fat through the bloodstream, is approximately one-fifth of your triglyceride level. So a triglyceride reading of 200 mg/dL suggests a VLDL of about 40 mg/dL.
How High Triglycerides Damage Arteries
Elevated triglycerides don’t just sit harmlessly in the blood. They travel inside particles called triglyceride-rich lipoproteins, and these particles can get trapped in artery walls. Once lodged there, immune cells called macrophages swallow them whole, bloating into “foam cells” that form the core of arterial plaque. Unlike LDL cholesterol, which typically needs to be chemically modified before macrophages absorb it, triglyceride-rich particles can trigger this process without any modification at all.
The damage doesn’t stop there. These particles also promote inflammation in the cells lining your arteries, making it easier for more fat to accumulate. They trigger the release of reactive oxygen molecules that stress the artery wall and weaken its protective barrier. And through a chain of exchanges between different blood fats, high triglycerides promote the creation of small, dense LDL particles, the form of LDL that is most likely to penetrate artery walls. So even if your LDL number looks acceptable, high triglycerides can make whatever LDL you have more dangerous.
The Pancreatitis Threshold
At very high levels, triglycerides pose a separate and more immediate risk: acute pancreatitis, a sudden and intensely painful inflammation of the pancreas. This complication is unlikely below 1,000 mg/dL, but once levels cross that mark, the risk jumps to about 10 percent. Above 5,000 mg/dL, the risk exceeds 50 percent. Pancreatitis from extreme triglycerides is a medical emergency and typically requires hospitalization.
What Pushes Levels Up
Diet is the most direct lever. Because your liver converts excess calories into triglycerides, any calorie surplus raises them. But certain foods are especially potent triggers. Refined carbohydrates and added sugars, particularly fructose, push your liver to ramp up triglyceride production. Alcohol has a similar effect; even moderate drinking can noticeably raise levels in some people.
Several health conditions also elevate triglycerides independently of diet. Underactive thyroid, poorly controlled diabetes, kidney disease, and obesity all interfere with how efficiently your body clears triglycerides from the bloodstream. Women face additional risk during the third trimester of pregnancy and after menopause, when hormonal shifts alter fat metabolism.
Medications can be a hidden contributor too. Some blood pressure drugs (specifically nonselective beta-blockers), certain antipsychotic medications like clozapine and olanzapine, and antiretroviral protease inhibitors used to treat HIV are all known to raise triglyceride levels. If your numbers jump after starting a new medication, that connection is worth discussing with your provider.
Physical Signs of Very High Levels
Most people with elevated triglycerides feel nothing at all, which is why the condition is usually caught through routine bloodwork. However, when levels reach extreme territory, the body can produce visible clues. Eruptive xanthomas are small, pea-sized, waxy bumps that appear on the skin, typically on the buttocks, shoulders, arms, and thighs. They range in color from yellow to orange-red and may have a small red halo around them. The bumps can be itchy and tender. They’re harmless on their own but signal that triglycerides are dangerously high and need treatment.
Lowering Triglycerides
Lifestyle changes are the first line of defense and often the most effective. Cutting back on sugar, refined carbs, and alcohol directly reduces the raw material your liver uses to manufacture triglycerides. Losing even a modest amount of weight improves how efficiently your body clears triglycerides from the blood. Regular aerobic exercise helps too, both by burning triglycerides for fuel and by improving the enzymes that break them down.
When lifestyle changes aren’t enough, medications can help. Fibrates are the most targeted option, lowering triglycerides by 30 to 50 percent. Statins, though better known for lowering LDL cholesterol, also reduce triglycerides by 10 to 30 percent and are commonly prescribed when both numbers need attention. Prescription-strength omega-3 fatty acids (high-dose fish oil) are another option, though their effect on long-term heart outcomes is less clear-cut than their ability to lower the number on a lab report.
For people in the severe range above 500 mg/dL, the immediate priority shifts from cardiovascular risk to preventing pancreatitis. Treatment in that range typically combines medication with strict dietary fat restriction to bring levels down quickly.