Understanding the Science and the Risks
Concerns about whether an iPhone—or any cell phone—can cause brain injury or brain cancer have circulated for years, especially among individuals living with degenerative brain diseases or cancer. As smartphone use continues to grow, many people focus on exposure to electromagnetic frequency (EMF).
What Is EMF and Where Does It Come From?
EMF is an invisible form of radiation emitted by many everyday sources: cell towers, radio antennas, computers, Wi‑Fi routers, power lines, and, of course, iPhones and other mobile phones.
- Ionizing EMF (e.g., X‑rays, gamma rays) has enough energy to ionize atoms or molecules, which can damage DNA and increase cancer risk.
- Non‑ionizing EMF (e.g., from iPhones, Wi‑Fi, radios) does not carry enough energy to ionize atoms or molecules and is widely believed not to directly cause cancer.
What Does the Research Say?
Over the last 15+ years, multiple large studies have examined potential links between cellphone use and cancer:
- INTERPHONE (13 countries): Suggested a possible increased risk of glioma among very heavy users, but did not establish a definitive causal link.
- Danish cohort study: Tracked ~400,000 people for 13 years and found no association between cellphone use and brain tumors.
- UK cohort study: Followed ~800,000 women for seven years and likewise found no conclusive link between cellphone use and brain tumors.
Some researchers have explored related effects, including whether radiofrequency exposure may contribute to oxidative stress—a process associated with certain degenerative conditions and symptoms such as headaches or skin irritation. Findings to date remain mixed and not conclusive.
Official Positions on Cellphone RF Exposure
The World Health Organization (WHO) classifies radiofrequency electromagnetic fields—including those from cellphones—as “possibly carcinogenic to humans.” At the same time, U.S. health agencies have not concluded that normal cellphone use is proven to cause brain injury or cancer.
Should You Be Concerned?
Current evidence does not conclusively show that iPhone or cellphone use causes brain cancer or brain injury. Still, simple, practical steps can reduce exposure while preserving convenience:
- Use hands‑free options or speakerphone to keep the device away from your head.
- Limit prolonged calls when feasible; consider texting or using wired headsets.
- Avoid carrying your phone directly against your body for extended periods.
If you have questions about head injuries from accidents (not EMF), see our page on traumatic brain injury.
Disclaimer: This article is for informational purposes only and does not constitute medical or legal advice. For guidance about your health, please consult a licensed medical professional.