Patients with bladder cancer can eat sea cucumber. Eating sea cucumber does not lead to accelerated progression of bladder cancer, nor does it increase the malignancy of bladder cancer. Sea cucumber is rich in protein and collagen, which helps to strengthen the immune system after a long period of intake. However, sea cucumber is not a medicine for cystitis, but only a food to supplement essential nutrients. As far as bladder cancer is concerned, it requires surgery or post-operative bladder infusion chemotherapy to completely remove the cancerous tissues in the body and achieve a clinical cure. If bladder cancer cannot be cured, there may be local recurrence or signs of metastasis in the future. Regular review for early detection of recurrence and metastasis and early treatment can achieve the purpose of prolonging the survival rate of patients, and sea cucumber can be used during the recovery period after treatment.