Cancer is a condition where cells in a part of your body grow and reproduce uncontrollably. The cancerous cells can invade and destroy surrounding healthy tissue, including organs.
Cancer sometimes begins in one part of your body before spreading to other areas. This process is known as metastasis.
More than 1 in 2 people will develop some form of cancer during their lifetime.
In Ireland, the 5 most common types of cancer are:
- prostate cancer
- breast cancer
- bowel cancer
- lung cancer
- skin cancer
There are more than 200 different types of cancer. Each type is diagnosed and treated in their own way.
A classification system is used to describe the amount and spread of cancer in a patient's body called TNM.
- T describes the size of the tumour and any spread of cancer into nearby tissue
- N describes spread of cancer to nearby lymph nodes
- M describes metastasis - the spread of cancer to other parts of the body
You can find links on this page to information about other types of cancer.
Spotting signs of cancer
Changes to your body's normal processes or unexplained symptoms can be early signs of cancer.
Symptoms you should ask a GP to check include:
- a new lump/bump that appears on your body
- a changing lump or bump
- unexplained bleeding
- changes on your skin
- losing weight without trying
- constantly tired
- changes to your bowel habits
- a new, persistent cough
Often, your symptoms will not have anything to do with cancer. They'll be caused by other, non-cancerous health conditions.
Read more about signs and symptoms of cancer
Reducing your risk of cancer
Changes to your lifestyle can have a big impact on reducing your risk of developing cancer.
You can reduce your risk by:
- not smoking
- limiting how much alcohol you drink
- maintaining a healthy body weight
- protecting skin from the sun and not using sunbeds
- healthy eating
- taking regular exercise
- breastfeeding your baby if you can
- vaccinating children against hepatitis B and HPV
You cannot reduce your risk of cancer completely. But you could prevent common cancers by staying healthy.
Cancer screening
Take part in cancer screening programmes. These can help diagnose the early stages of cancer, or find and treat conditions that can lead to cancer:
- bowel cancer (men and women)
- breast cancer (women)
- cervical cancer (women and people with a cervix)
Read more about screening and vaccinations
Cancer treatment
Your treatment will depend on the type of cancer you have and the stage it's at.
Cancer support in the community
Community cancer support centres are in most local communities and provide support services for cancer patients, their families and carers. The centres provide remote and in-person services.
The support services provided by cancer support centres include:
- counselling and psychological support
- manual lymphatic drainage
- physical activity programmes
- survivorship programmes
- complementary therapies
Find a list of support centres - cancer.ie
Support for cancer survivors
The Cancer Thriving and Surviving programme gives cancer survivors a chance to learn self-management skills when moving on from your cancer treatment.
The programme is run over 6 weeks and is available at different areas around the country.
Content supplied by the NHS and adapted for Ireland by the HSE
