Can patients with bladder cancer take Rehmannia glutinosa (Sh熟地黄)?
Generally, patients with bladder cancer can take prepared rehmannia (Shu Di Huang), but it should be used under the guidance of a doctor. Detailed explanation is as follows:

Prepared rehmannia has multiple functions, including nourishing the kidneys and yin, enriching essence and marrow, and replenishing blood and nourishing yin. Hematuria is often caused by damp-heat descending, internal blood stasis, or deficiency of vital qi. Treatment should focus on clearing heat and removing dampness, promoting blood circulation to remove blood stasis, and strengthening vital qi. Prepared rehmannia not only helps stop bleeding but also inhibits the growth and metastasis of cancer cells. For patients with bladder cancer, it can alleviate hematuria symptoms and assist in anti-cancer treatment. In addition, prepared rehmannia can enhance kidney detoxification function and improve immunity.
However, it should be noted that the use of traditional Chinese medicine should be conducted under the guidance of a qualified physician. Each patient's condition, constitution, and physical condition are different, so the specific dosage and medication plan must be adjusted by a professional TCM practitioner according to the individual patient's condition. Moreover, prepared rehmannia belongs to the category of tonic herbs and should be used cautiously or avoided in patients with certain constitutions or conditions, such as qi stagnation with excessive phlegm, abdominal distension and pain, poor appetite, or diarrhea.