Hi Blood in the urine/ hematuria can be due to a wide range of conditions such as : viral illness, trauma to the urinary tract , stones, infection, sexual activity, fever, exercise, inflammation of the kidney , bladder,ureter blood disorders drugs- there are certain medications that can increase the risk of hematuria, some of them are oral contraceptives, aspirin, diuretics, some pain medications,warfarin blood clots cancers of the urinary tract sickle cell disease cysts high levels of uric acid or calcium in the urine. There are also a some other causes. To find out what may be causing your hematuria , you will need to revisit your doctor . He or she will re-examine the urine with a dipstick, may send urine to the lab to let them check for the blood, the presence of protein in the urine or other particles. Blood tests may also be done to futher assess kidney function.Based on the information obtained from the history, examination and above investigations then possible next steps ( if the problem continues- in some cases it may resolve or the cause may already be highlighted and treated) would be imaging or referral to a specialist. I hope this information helps you.