If it is in case of a girl it could be starting of menses but if it is in case of adult women then it could be due kidney stones if there is pain n buring sensation or due to urinary tract these occur when bacteria enter your body through the urethra and multiply in your bladder or kidney infections in which the bacteria from urethra enters into kidney. In in case of boys or men it could b due to enlargement of prostate gland or UTI or kidney stones or infections. It is commonly called hematuria, — allow blood cells to leak into urine. Various problems can cause this leakage....
From most simple... could be simple bladder/uti infection, polynephritis, cysts or stones in kidneys, CRF and protourea to kidney, bladder infections. Drug reactions/trauma. The list goes on.
Hematuria is the presence of red blood cells in the urine. Visible hematuria, also known as gross hematuria, is easily identified, as it causes red or brown discoloration of the urine. Microscopic hematuria is invisible to the naked eye and is often found incidentally on urinalysis or urine dipstick.
Visible hematuria causes brown or red discoloration of the urine that is visible to the naked eye. It can be painful or painless. Painful Kidney stones–suspected in a person with unilateral sharp flank pain that radiates to the groin, burning on urination, and fever Infection of the lower urinary tract or bladder–causes visible hematuria, white blood cells in the urine, and lower abdominal pain Pyelonephritis, infection of the kidneys–causes fever, white blood cells in the urine, and flank pain Polycystic kidney disease–a genetic disorder that causes cysts in the kidney Trauma–including blunt trauma to the urinary tract or traumatic foley catheter placement
Painless The most worrisome cause of painless, visible blood in the urine is kidney or bladder cancer, especially in a person with risk factors such as male sex, age over 35, history of smoking, chronic bladder inflammation, and occupational exposures (to aromatic amines and aniline dyes) Between 80-90% of people with bladder cancer initially presented with visible hematuria.
Other causes include Exercise-induced hematuria–occurs in up to 30% of long distance runners and often resolves a few days after running cessation
Common causes of visible hematuria in pediatric populations are: •urinary tract infection •perineal or urethral irritation •congenital abnormalities– *Non-vascular—ureteropelvic junction obstruction, posterior urethral valves, urethral prolapse, urethral diverticula, multicystic dysplastic kidney *Vascular—arteriovenous malformations, hereditary hemorrhagic telangiectasias, renal vascular thromboses
Other causes include: trauma acute nephritis—characterized by visible hematuria, white blood cells in the urine, and a transient decline in renal function, commonly caused by medications coagulopathy kidney stones IgA nephropathy–suspected in a child with dark urine and recent upper respiratory infection[4] Post-streptococcal glomerulonephritis–suspected in a child with dark brown urine following recent streptoccocal pharyngitis or impetigo
