These cells may start in one part of the body, before spreading elsewhere.
The most common types of cancer to be diagnosed in the UK include breast cancer, lung cancer, prostate cancer, and bowel cancer.
But, there are more than 200 different types of cancer, and each one causes its own specific type of symptoms.
Cancer symptoms: Five unexpected signs of cancer to look out for (Image: GETTY Images)
Some of the most common cancer symptoms include changes to your bowel habits, weight loss, or finding unexplained lumps and bumps on your body.
However, some cancers can cause signs and symptoms that may otherwise go unnoticed and can be unexpected , according to not-for-profit organisation AARP.