Various factors can cause elevated BUN levels, including:
Dehydration: Reduced fluid intake or excessive fluid loss can concentrate the blood, increasing BUN levels. Kidney Disease: Impaired kidney function reduces the ability to excrete urea. High Protein Diet: Increased protein intake leads to higher production of urea. Gastrointestinal Bleeding: Blood breakdown in the digestive tract can increase urea levels. Heart Failure: Reduced kidney perfusion can impair urea excretion.
