“20-Year Physician Breaks Down Common Cancer Myths vs. Real Causes”

Physician Reveals What Truly Causes Cancer vs. Common Misconceptions

Cancer remains one of the leading causes of death worldwide. According to the World Health Organization (WHO), nearly 10 million people died of cancer in 2020, accounting for almost one in six deaths globally. In the United States alone, the National Cancer Institute estimates that 618,120 people will die of cancer in 2025.

Understanding what truly drives cancer and adopting lifestyle habits that reduce risk is essential. On December 17, Dr. Thomas Hemingway, MD—a board-certified physician, best-selling author, and health educator with over 20 years of experience—shared insights on Instagram about the real causes of cancer and common misconceptions.

Common Misconceptions About Cancer Causes
Many people believe cancer is driven by:

• Genes
• Bad luck
• Red meat
• Sun exposure
• Age

Family history

What Actually Increases Cancer Risk
Dr. Hemingway explained that the following factors play a more significant role in cancer development:

Xenoestrogen exposure – Plastics, fragrances, pesticides, and household chemicals mimic estrogen and overload the hormonal system.

High intake of polyunsaturated fats (PUFAs) – Oils like canola oxidize easily, driving inflammation and cellular stress.

Low progesterone – Imbalances increase estrogen’s inflammatory and proliferative effects.

Low thyroid function – A sluggish thyroid slows metabolism and detoxification, impairing cell repair.

Exposure to heavy metals – Mercury, cadmium, arsenic, and lead interfere with cellular regulation.

Nutrient deficiencies – Lack of B vitamins and other nutrients disrupts DNA repair, immune function, and healthy cell turnover.

Chronically high cortisol – Persistent stress hormones suppress immunity and create inflammation.

Chronic exposure to artificial light – Blue light at night disrupts circadian rhythm and melatonin production.

Lack of sunlight – Low vitamin D weakens immune surveillance and natural cancer-fighting capacity.

Emotional stress and trauma – Long-term emotional strain can suppress immunity, disrupt hormones, and raise inflammation.

Poor sleep – Sleep loss affects hormones, immunity, and the body’s nightly repair processes.

Dr. Hemingway’s advice underscores that while genetics and chance play a role, lifestyle, environment, and systemic health factors are critical determinants of cancer risk.