Cancer: the complex world of a life-changing illness


Cancer is a complex, life-changing illness affecting millions of people around the world. Being diagnosed is a devastating blow that signals the start of an extremely challenging journey and the best way to navigate it is to ensure you're well informed.

The word 'cancer' is the term for a group of different diseases - haematological (blood) cancers and solid tumours - which include malignant tumours of different sites in the body. There are over two hundred different kinds of cancer that can develop in almost any organ or tissue, such as your lungs, colon, breast, skin, bones or nerve tissue.

Most cancers are named after the organ or type of cell in which they originate and are characterised by the uncontrolled growth of abnormal cells.

Main cancer categories

According to CANSA, cancers are classified into six major categories based on tissue types:

  • Carcinomas originate from the epithelial layer of cells that form the lining of external parts of your body or the internal linings of organs within your body
  • Sarcomas originate in connective and supportive tissues including your muscles, bones, cartilage and fat. Bone cancer or osteosarcoma mostly affects young people
  • Myelomas (a form of blood cancers) originate in the plasma cells of bone marrow that produce various antibodies in response to infections
  • Leukaemia is a group of cancers that are classified as blood cancers. These cancers affect the bone marrow where blood cells are produced. When cancerous, the bone marrow begins to produce excessive immature white blood cells that fail to perform their usual actions and you’re often prone to infection
  • Lymphomas are cancers of the lymphatic system. Lymphomas may be of two types – Hodgkin’s lymphoma and Non-Hodgkin’s lymphomas. In Hodgkin’s lymphoma there is characteristic presence of specific cells in the tissue samples which are not present in Non-Hodgkin’s lymphoma
  • Mixed types have two or more components of the cancer.

Related articles


Pushing limits and shedding pounds: How Dumi found a sport she loves

Spring brings a scurry of activity as the earth bursts into life. Use this season to fall in love with a fitness activity that keeps you coming back for more. Dumisile Mthalane did just that. By finding a sport where she can soak up the sunshine, she's transformed the way she looks, thinks and feels.


Diets are changing. 5 ways to take back healthy habits

As a nation, we're experiencing an alarming rise in obesity and diet-related diseases. Something has changed about the way we interact with our food. Here’s how to get ourselves (and our kids) back on track.


Catching up with Wayde and Chad: how they reach their goals, and how you can too

We chatted to Discovery Vitality Ambassadors Wayde van Niekerk and Chad le Clos on their recent sporting victories and gleaned pointers on how to 'get to gold' in our own health and wellness journeys.

Log in

Please click here to login into Discovery Digital Id

Please click here to login into Discovery Digital Id