High urea nitrogen measurement may be caused by dietary factors or by diseases such as glomerulonephritis, renal insufficiency and renal failure. 1. Dietary factors: if you eat a lot of high protein food before taking blood draw, it may lead to high urea nitrogen measurement results. 2. Glomerulonephritis: Glomerulonephritis has a variety of causes, including heredity, infection, immunity and other factors. The main symptoms of patients are hematuria, proteinuria, edema, etc. Fatigue, fever, weight loss and other symptoms, which will lead to high urea nitrogen results in the examination. 3. Renal insufficiency: The causes of renal insufficiency are complicated, mainly including diabetic nephropathy, hypertension and so on. Patients will have weakness, itchy skin, palpitations (rapid heartbeat, often accompanied by panic), chest pain and other symptoms, but also nausea, vomiting, shortness of breath and other symptoms, which will also lead to patients with high urea nitrogen measurement. Patients with high urea nitrogen measurements are advised to go to the hospital in time and follow the doctor’s instructions for treatment.