Cancer is caused by cells in a specific part of the body growing and reproducing uncontrollably.
These cells – cancerous cells – destroy the healthy tissue surrounding them, including organs.
But, looking out for early signs of cancer may improve your chances of treating the disease if it’s diagnosed.
One of the symptoms of blood cancer is having lumps or swellings on, or around the groin.
Cancer of the white blood cells is known as leukaemia. It develops as a result of abnormalities within the blood cells.
About 10 per cent of all cancer cases in the UK are blood cancer cases, according to HCA Healthcare UK.
There is a general lack of understanding amongst the public about the warning signs and symptoms of blood cancer, it said.
One of the earliest signs of blood cancer is having lumps or swellings in the groin, as well as the neck and armpits.
“Swollen lymph nodes found on the neck, groin, and armpit are most often reactive, for example due to an infection,” said Dr Adrian Bloor, from The Christie Private Care, part of HCA Healthcare UK.
“Persistent unexplained lymph node enlargement can, however, be an indication that abnormal white blood cells are building up in the lymph glands.
“Swollen lymph nodes due to lymphoma are often painless however, that doesn’t mean they should be ignored.
“If you discover a new lump or swelling which does not go away after a few days, then the recommendation is to seek medical attention so that it can be thoroughly assessed.
“It could be an early indicator of blood cancer – and is most commonly associated with lymphoma.”
Other blood cancer symptoms include tiredness and unexplained weight loss, said Bloor.
People that easily bruise, or bleed without any noticeable cause, may also be at risk of the cancer.
More than 30,000 people are diagnosed with blood cancer in the UK every year.
The most common types of blood cancer are leukaemia, myeloma and lymphoma.
Making some simple diet or lifestyle changes could help to lower the risk of developing cancer, said the NHS.
Eating a healthy, balanced diet and not smoking is crucial to avoiding tumours.
Regular exercise may also help to stave off cancer, it said. All adults should aim for at least 150 minutes of moderate-intensity activity every week.