Hi, Thanks for writing in. There is a possibility of grade I kidney trauma and that might be reason for small traces of blood in your urine. The pain during coughing and sneezing is probably associated with soft tissue injury to the abdominal wall muscles not related to kidney injury. Since you have grade I kidney injury due to blunt trauma, the treatment is conservative and will improve with rest and medications. If CT scan has been done then any other serious condition is ruled out. Since the injury is recent, healing will take time and it is suggested that you do not stress yourself physically and take rest from mountain biking and other physical activities for about 15 days. You might get repeat blood test done to know if there is microscopic bleeding in the urinary tract. If present then a discussion with your urologist is required.