Blood clots in the bladder are considered to be related to cystitis, urethral stones, bladder cancer and other diseases, and need to go to the hospital for further examination to clarify the cause of the disease, and then consult the doctor in time. 1. Cystitis: usually the mucous membrane in the bladder, after being stimulated by pathogenic bacteria, becomes congested, swollen, etc. After the mucous membrane ruptures, it bleeds and causes the phenomenon of blood clots in the bladder, and there will be discomfort in urination, pain in the lower abdomen and other symptoms, which can be treated with medicines such as Minocycline Hydrochloride Capsules, Cefixime Capsules, etc. under the guidance of the doctor. 2. Urethral calculi: It is usually due to the stones in urethra, which gradually increase in size and may scratch the mucous membrane in urethra, making the mucous membrane locally congested, which leads to the phenomenon of blood mixing with urine and coagulating to form blood clots, and urethral calculi usually present symptoms such as difficulty in urination, pain and so on. 3. Bladder cancer: due to ulceration, necrosis and infection in bladder cancer tissues, which leads to the phenomenon of blood clot in the bladder, and symptoms such as hematuria will appear. If the phenomenon of blood clots in the bladder occurs, it may also be related to prostatitis, bladder stones and other diseases, and it is necessary to go to the hospital in time to prevent the occurrence of adverse consequences.