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Yes alcohol has direct toxic effect on the kidneys --can cause bleeding from the glomeruli and also from the bladder.
Another possibility can be the passage of small kidney stone.
Alcohol acts like a diuretic and can flush out a small stone which can cause pain and then blood in the urine.
Probably nothing serious.
But this warrants a clinical evaluation by your doctor as well.
Please avoid drinking for now.
Drink plenty of fluids to prevent dehydration.
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