In 2021, over 1.9 million people were diagnosed with cancer in the U.S., with over 610,000 deaths. Globally, cancer caused nearly 1 in 6 deaths in 2020. Hyperbaric therapy (HBOT) is now used alongside radiation and chemotherapy to optimize dosages, shrink tumors, and lessen treatment side effects. It increases oxygen levels to counter the hypoxic environments where cancer thrives, weakening tumors and their aggressiveness.