Breathlessness can be caused by cancer or its treatment. Other medical conditions can also cause breathlessness.
Find out how treatments such as surgery, chemotherapy and radiotherapy might affect your breathing.
Read about how cancer and its treatment can affect your heart, and might lead to breathlessness.
Read about how cancer can cause fluid to collect around the lungs or in the tummy (abdomen).
Find out how a blood vessel blockage in the neck can cause breathlessness.
Information on other causes of breathlessness, including anaemia and chest infections.