Blood clots may appear in early stage of bladder cancer, which is mainly related to the damage of mucous membrane and the rupture of blood vessels, and needs to be combined with clinical symptoms for comprehensive judgment. Due to rapid tumor growth, bladder cancer patients have more neovascularization, and neovascularization is “brittle”, so it is easy to rupture; in addition, infiltrative growth of tumor will invade blood vessels and cause blood vessel damage; all kinds of reasons can cause blood vessel rupture and bleeding, etc. If bleeding is heavy and accumulates in the bladder, it can cause blood clots. If the bleeding is heavy and accumulates in the bladder, it may cause blood clots. Patients with early stage of bladder cancer may also have blood clots, which are usually intermittent and may be manifested as hematuria in the naked eye, blood in the urine/clots, and difficulty in urination. If bladder tumor is suspected or diagnosed, it is recommended to go to regular hospitals for comprehensive assessment of the condition, follow the doctor’s instructions to cooperate with the treatment, and choose the appropriate treatment plan to avoid delaying the condition.