How quickly does palliative radiotherapy relieve coughing up blood?

Radiotherapy targets a tumour or area that is contributing to airway bleeding. As the treated tissue responds, bleeding may lessen, but the timing is not predictable for everyone. Other care may be needed first or alongside it, such as checking blood counts, reviewing blood-thinning medicines, treating an infection, controlling the cough, or managing the airway. The team will ask about the amount and colour of blood, how often it occurs, and whether breathing has changed.

Report any new blood in sputum to your cancer team, even if it is a small streak. Sit upright, avoid smoking, and follow the agreed plan for cough or bleeding medicines. Do not stop a prescribed blood thinner unless a clinician tells you to. Keep track of episodes and bring that information to the team. Read about [Coughing Up Blood](/symptoms/coughing-up-blood/) and [Palliative Radiotherapy](/treatments/radiation-oncology/palliative-radiotherapy/).

Call emergency services for more than a small amount of blood, repeated bleeding that is increasing, clots, severe breathlessness, chest pain, dizziness, fainting, blue lips, or confusion. Do not wait for radiotherapy to take effect when bleeding is heavy or breathing is affected.

What is the likely source of the bleeding, and how soon should I expect a change? What should I do during another episode? Do any of my medicines need review before treatment?