Many things. It could be harmless like menstrual blood or it could be an infection or an injury or even something worse - see your doctor if you are seeing blood without having your period.
The most usual cause of blood in the urine is a kidney stone.
Aids
Depends on WHY there is blood in your urine. There are several possible causes with different treatments. See a doctor. Now.
Blood.
kidney stone
Urinary tract infection, go to the vet
Nausea and dizziness coupled with blood in the urine should be evaluated by a doctor. This can be a serious condition that requires medication and possibly hospitalization and testing.
sorry, but you have an S.T.D, I think
Kidney stones could be a cause. Sometimes when a kidney stone is passed it causes a little bleeding.
They are a few different problems. The most common is Urinary Tract Infection which is treated by a antibiotic. A UTI can also infect the kidneys, which causes pain in the side(s), and fever. A simple urine test will reveal whether you have a urinary infection.
Blood in urine is a symptom of a number of medical conditions. The two most common causes are urinary tract infections and kidney stones. Rarer illnesses causing blood in the urine can be serious, such as tumours. If you are suffering from this problem you should seek medical attention immediately.
A severe urinary tract infection that has moved into the kidneys or any infection in the kidneys can cause blood in the urine. If you are seeing blood in your urine see a doctor as an infection in the kidneys can cause permanent kidney failure