Urea nitrogen high visibility of the following three conditions: 

In the first case: the high seen in acute renal nephritis, chronic nephritis, toxic nephritis, severe pyelonephritis, renal tuberculosis, renal vascular sclerosis, congenital polycystic kidney disease and kidney tumors induced renal dysfunction. Especially for the diagnosis of uremia special value, which increased proportional to the degree of severity, such as azotemia BUN over 9mmol / L, to uremia BUN exceed 20mmol / L, to help estimate the disease . 

The second case: the high seen before renal congestive heart failure, severe burns, shock, gastrointestinal bleeding, dehydration, severe infection, diabetic acidosis, adrenal insufficiency, liver and kidney syndrome. 

The third case: the high seen after renal tract obstruction due to an increase in renal tissue pressure, glomerular filtration pressure is lowered, such as an enlarged prostate, urethral obstruction caused by tumor compression or both sides of ureteral calculi. Elevated blood urea nitrogen can simply because excessive intake of dietary protein foods caused by changes in diet, balancing protein, sugary foods and mix vegetables, will soon be back to normal. So, as a clear cause, it is best to consult with a doctor before deciding treatment too. 

Blood urea nitrogen is one of the main indicators of renal function. Therefore, changes in blood urea nitrogen greater impact on the non-protein nitrogen values. Often used in the clinical detection of urea nitrogen instead of measuring non-protein nitrogen. High blood urea nitrogen in blood urea nitrogen due to this organ after glomerular filtration excreted in the urine, if the excretion of kidney function deteriorates, the blood urea nitrogen concentration increases. Thus, urea nitrogen understand kidney function has become an important indicator of whether the normal. 

As for treatment, depending on your specific kind of cause, a detailed analysis, I suggest you pay attention to containing B vitamins and vitamin C-rich foods on the diet.