The mode of occurrence of carnal hematuria.
The hematuria at the beginning of voiding is most often due to anterior urethral lesions, such as inflammation, foreign bodies, stones, polyps, or injury to the urethra of the penile segment; hematuria or dripping blood at the end of voiding is commonly due to inflammation, polyps, and tumors of the posterior urethra, seminal vesicles, bladder triangle, and prostate throughout the hematuria is commonly due to nephritis, inflammation, stones, and tumors of the kidneys, ureters, and bladder.
Hematuria appears as a precursor infection: hematuria (mostly carnivorous) occurs within hours or 1-3 days after upper respiratory tract infection or diarrhea, mainly in acute nephritis syndrome, and the pathologic diagnosis on renal biopsy is mostly IgA nephropathy; hematuria occurring within 1-3 weeks after skin or upper respiratory tract infection is one of the diagnostic criteria for acute glomerulonephritis; some patients with crescentic nephritis often have a history of upper respiratory tract infection 1 month before the onset of the disease. Some patients with crescentic nephritis often have a history of upper respiratory tract infection about 1 month before the onset of the disease; hematuria after infective endocarditis can be seen in glomerulonephritis.