Some people are born with fissured tongue, while others develop tongue fissures from eating a poor diet, infections, or injuries. Tongue fissures don't hurt. However, food particles can get stuck in them and cause irritation and bad breath. If you have a fissured tongue, gently scrub it every time you brush your teeth. Using a mouth rinse can help remove food particles as well.
The filters in the kidney prevent blood from entering the urine. When you have hematuria, the filters in the kidneys or other parts of the urinary tract (the kidneys, ureter, and bladder that work together to remove wastes) allow blood to leak into the urine. There are two types of hematuria; microscopic or gross hematuria. Microscopic hematuria means that the blood can only be seen with a microscope. Gross hematuria means the urine appears red or the color of tea or cola to the naked eye. What causes hematuria? Hematuria is common and can have many different causes. These causes include: Inflammation of the kidney, urethra, bladder, or prostate (in men) Abnormal structures in the urinary tract. Inherited diseases, like polycystic kidney disease , sickle cell disease, or hemophilia. Mineral imbalances in the urine.
1 Bladder infections (urinary tract infections) - Urinary tract infections are very common, and can cause both gross and microscopic hematuria. Often there is pain, but these can be painless, especially in elderly people and children.  Kidney stones - Kidney stones can cause blood in the urine.