What causes low blood urea nitrogen levels?

Under normal circumstances, low blood urea nitrogen (BUN) levels may be caused by insufficient protein intake, dehydration, hepatitis, acute glomerulonephritis, or renal failure. If discomfort occurs, timely medical consultation is recommended. Specific analyses are as follows:

1. Insufficient Protein Intake

Urea nitrogen is the end product of protein metabolism in the body. If dietary protein intake is inadequate, it may lead to reduced protein breakdown and consequently lower BUN levels. This condition typically does not cause obvious symptoms. It is recommended to moderately increase intake of protein-rich foods such as lean meat, fish, eggs, and dairy products.

2. Dehydration

Failure to replenish fluids after intense physical activity may lead to dehydration, resulting in concentrated urine and a temporary decrease in BUN levels. Symptoms often include reduced urine output and dizziness. It is advised to promptly rehydrate with fluids and electrolytes.

3. Hepatitis

Viral infections may trigger hepatitis. The inflammatory response can impair the liver's ability to synthesize urea from proteins, leading to decreased BUN levels in the blood. Symptoms may include jaundice and fatigue. Treatment under medical supervision may include antiviral medications such as oseltamivir phosphate capsules, antiviral oral solution, and acyclovir tablets.

4. Acute Glomerulonephritis

Damage to the glomeruli may lead to glomerulonephritis. During the polyuric phase of acute glomerulonephritis, increased urine output may result in excessive urea excretion, causing low BUN levels. This condition is often accompanied by symptoms such as edema and hypertension. Under medical guidance, treatment may include torasemide tablets, furosemide tablets, and irbesartan hydrochlorothiazide tablets.

5. Renal Failure

Factors such as infection or reduced intrarenal blood volume may lead to renal failure, increasing the kidney's clearance of urea and thereby lowering BUN levels. Symptoms may include anemia and edema. Treatment should follow medical advice and may involve medications such as benazepril hydrochloride tablets, compound ferrous sulfate granules, and ferrous succinate granules.

In daily diet, consumption of spicy, raw, or cold foods should be avoided to prevent bodily discomfort.