Why is my cat weeing in the house?

The cat needs to be seen ASAP. Blood in the urine is nothing to mess around with especially a male cat. & if he is urinating small amounts it could be that he is getting blocked with crystals. This is LIFE THREATENING. Their bladder can rupture. Please take him in as soon as possible waiting more than 48 hours can be deadly. Good luck to you and your kitty!