A study found that cancer cases in adults under 50 years old have risen sharply.

The study was published by BMJ Oncology and analyzed data between 1990 to 2019, finding an increase of 79% in cancer among people under 50 years old in just three decades.

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Researchers at the Zhejiang University School of Medicine and University of Edinburgh’s Usher Institute found that in the year 2019, new cancer cases increased in young people from 1.82 million to 3.26 million in 2019.

Many of the cancers that were found to be among this unusually younger group were of the breast, trachea, lung, bowel, and stomach. The most common cancers were windpipe, prostate cancer, digestive system, skin, and breast.

North America had the highest amount of early-onset cancers in 2019, but other parts of the world, including Eastern Europe, Oceania, and Central Asia, saw the highest mortality rates. Doctors credit early screenings with helping some declines in cancer.

The study authors credit the “local environment, lifestyle and level of available medical treatment” for the varied severity of the cancer cases.

Some experts around the world have speculated that the increased use of the "Western diet" with red meat and salt could be contributing factors to the cancer rates. Other experts suggest that excess weight and genetic factors could be involved in the change.

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The study's research period ended in 2019 and did not cover the impact of adequate treatment and preventive measures to treat cancer during the COVID-19 pandemic.

According to the National Institutes of Health, the pandemic "has affected the delivery of cancer care and increased the risk of mortality for patients." Cancer deaths were estimated at 10 million in 2020, according to the World Health Organization.