Why Cancer in Young Adults is Rising – and Why Their Needs Are Different

A Global Rise in Early-Onset Cancers

Cancer has long been seen as a disease of ageing. Yet across Singapore and worldwide, more people in their 20s, 30s, and early 40s are being diagnosed. This shift is reshaping oncology and raising urgent questions about why younger adults are developing cancer – and how best to care for them.

While researchers are still working to understand the causes, one thing is already clear: cancer affects younger adults very differently from older patients, prompting the emergence of adolescent and young adult oncology – a growing field dedicated to their unique medical and life-stage needs.

What Scientists Know – and What They Do Not

Researchers are asking whether cancers in younger adults differ biologically from those diagnosed later in life. So far, findings are mixed. Some studies report differences in tumour behaviour, molecular features, and microbiome profiles, but results vary by cancer type. It is premature to conclude that early-onset cancers are fundamentally distinct diseases.

Why Younger Adults Need Different Cancer Care

While the biological science continues to evolve, the biggest differences between younger and older patients are often practical, physical, and psychosocial. Cancer strikes younger adults during a period typically defined by education, career building, relationships, and starting a family. A diagnosis can abruptly interrupt all of these.

Fertility is often an immediate concern. Some chemotherapy drugs, radiotherapy, and surgery can permanently affect fertility, making discussions about egg freezing, sperm preservation, or ovarian protection an important part of treatment planning before therapy even begins.