What's a possible diagnosis on recurrent, painless, gross hematuria? i've had it last month, it lasted for about 4 days. exactly a month later it happened again. what's the outcome? i was put on antibiotics & was told to drink lots of water. i seldom dran

Hematuria: Painful causes: stones, infection painless causes: renal cell carcinoma (very unlikely at 18), arteriovenous malformation of the kidney or urinary tract. You need to see a urologist and likely have a benign cause.

Need imaging: Antibiotics for gross painless hematuria is inappropriate.I am surprised no imaging (That is Xrays) was recommended. Do not ignore it dear.