Mobile Phone Use in Pregnancy Linked to Potential Risks
A 2026 systematic review finds most studies link prolonged mobile phone use during pregnancy to adverse outcomes like heart issues and shorter gestation
A systematic review of scientific literature has examined the potential health effects of mobile phone use during pregnancy. The review, led by researchers from Columbia University, Cornell University, and Johns Hopkins University and published in September 2026, found that while some no significant link, most associate intensive use with adverse fetal outcomes.
Columbia University's Mailman School of Public Health led the research. The team searched PubMed and Web of Science for studies published through February 2026. Author Norman Kleiman, Ph.D., an associate professor at Columbia, stated the need for clarity. "Existing studies examining mobile phone use and adverse pregnancy outcomes are limited and often contradictory," he said.
Sedentary Behavior as a Confounding Factor
Mobile phone use has skyrocketed globally. The number of users grew from about 500 million in 2000 to 6.4 billion by 2021. The average smartphone user now spends three to four hours daily on their device.
One study of 423 adults linked greater cellphone use with increased sedentary time. High sedentary behavior is itself associated with pregnancy risks like reduced gestational age and hypertensive disorders. Kleiman noted this complication. "Notably, mobile phone use may serve as a proxy for a sedentary lifestyle rather than strictly reflect radiation exposure," he explained. This makes it hard to isolate the effect of the phone's radiation.
How Phone Radiation Might Affect Pregnancy
Mobile phones emit nonionizing microwave radiation, known as radiofrequency electromagnetic fields (RF-EMFs). This type of radiation lacks the energy to break DNA bonds directly.
Research suggests chronic, low-level RF-EMF exposure may influence biological processes like cell signaling and membrane function. These changes have been investigated for links to noncancer effects including headaches and infertility. Exposure can also cause localized heating in tissues. High temperature is a known risk factor for organ dysfunction and altered blood flow.
The Challenge of Evolving Technology
The review highlights that future studies must account for broader exposure sources like Wi-Fi and cell towers. The rollout of 5G networks may create new exposure patterns. It is also key to distinguish between types of phone use. Voice calls involve close-range head exposure, while other activities have different patterns.
Practical Precautions and Research Gaps
The scientists suggest simple measures to reduce exposure during pregnancy, especially for higher-risk women. These include using speakerphone or wired headsets, keeping phones away from the abdomen, and enabling airplane mode when not in use.
Kleiman urged caution. Our findings should be interpreted with caution, he said. Co-author Ka Kahe, M.D., Sc.D., a professor at Columbia, emphasized the need for more rigorous research. While the accumulated evidence suggests possible adverse effects... Drawing firm conclusions remains premature, Kahe stated.
The full findings are published in the Journal of Exposure Science & Environmental Epidemiology.
