What to expect from hormone therapy for ductal carcinoma in situ

DCIS is contained within a breast duct. If testing shows hormone receptors, a medicine can block oestrogen signals or reduce the body's oestrogen effect on breast cells. Treatment is usually a tablet taken regularly, and the choice depends on your age, menopause status, medical history and other breast treatments. It does not replace surgery or radiotherapy when those are recommended.

Common effects can include hot flushes, night sweats, vaginal dryness, joint or muscle discomfort, mood changes and tiredness. Many people have manageable symptoms, but the balance between expected benefit and side effects is personal.

Take the medicine exactly as prescribed and keep a record of new symptoms. Do not stop it silently if side effects become difficult; your oncology team may adjust the plan or discuss another option. Mention medicines, supplements, blood-clot history, bone health, eye problems and any plans for pregnancy before starting. Keep scheduled breast imaging and follow-up appointments, because hormone therapy is one part of ongoing care.

Contact your care team promptly for unusual vaginal bleeding, persistent severe pain, marked mood changes or symptoms that interfere with daily activities. Seek urgent help for sudden chest pain, difficulty breathing, coughing blood, or new one-sided leg swelling and pain, which can signal a serious clot.

Ask whether your DCIS is hormone-receptor positive, what benefit the medicine is intended to provide, how long you may take it, and whether your personal history changes the choice. Also ask which symptoms deserve a call, how bone or clot risks will be monitored, and what alternatives exist if treatment is not tolerable.