Some patients with haematuria have sports haematuria, which usually occurs after strenuous exercise, due to increased blood flow to the kidneys and increased passage of red blood cells through the mucosal barrier, or due to the repeated impact of urine in the bladder on the bladder wall during strenuous exercise, causing damage to the bladder mucosa and bleeding caused by ruptured capillaries.
In addition, in patients with kidney stones, the stones are in an active state after strenuous exercise and the damage to the kidneys and urinary tract can also cause haematuria. Strenuous exercise with rhabdomyolysis, due to myoglobinuric urine with a soy sauce colour, may be accompanied by muscle pain and should be promptly investigated in hospital.