Boston, MA - New research from Brigham and Women's Hospital (BWH) finds that higher caffeine intake is associated with lower rates of tinnitus, often described as a ringing or buzzing sound in the ear when there is no outside source of the sounds, in younger and middle-aged women. This research is published in the August issue of the American Journal of Medicine.
In this prospective study, which followed more than 65,000 women in the Nurses' Health Study II, researchers tracked self-reported results regarding lifestyle and medical history from these women, aged 30 to 44 years and without tinnitus in 1991. Information on self-reported tinnitus and date of onset was obtained from questionnaires returned in 2009, with cases defined as women who reported symptoms "a few days/week" or "daily." After 18 years of follow up, researchers identified 5,289 cases of reported incident tinnitus.
"We observed a significant inverse association between caffeine intake and the incidence of tinnitus among these women," said Gary Curhan, MD, ScD, senior author of the paper and a physician-researcher in the Channing Division of Network Medicine at BWH and Professor of Medicine at Harvard Medical School.
Specifically, researchers report that when compared with women with caffeine intake less than 150 milligrams/day (approximately one and a half 8-ounce cups of coffee), the incidence of reported tinnitus was 15 percent lower among those women who consumed 450 to 599 mg/day of caffeine. The majority of caffeine consumed among the women was from coffee and the results did not vary by age.
"The reason behind this observed association is unclear," said Curhan. "We know that caffeine stimulates the central nervous system, and previous research has demonstrated that caffeine has a direct effect on the inner ear in both bench science and animal studies. Researchers note that further evidence is needed to make any recommendations about whether the addition of caffeine would improve tinnitus symptoms.
This research was funded by the National Institutes of Health (Grants UM1 CA176726 and DK91417).
Brigham and Women's Hospital (BWH) is a 793-bed nonprofit teaching affiliate of Harvard Medical School and a founding member of Partners HealthCare. BWH has more than 3.5 million annual patient visits, is the largest birthing center in Massachusetts and employs nearly 15,000 people. The Brigham's medical preeminence dates back to 1832, and today that rich history in clinical care is coupled with its national leadership in patient care, quality improvement and patient safety initiatives, and its dedication to research, innovation, community engagement and educating and training the next generation of health care professionals. Through investigation and discovery conducted at its Brigham Research Institute (BRI), BWH is an international leader in basic, clinical and translational research on human diseases, more than 1,000 physician-investigators and renowned biomedical scientists and faculty supported by nearly $650 million in funding. For the last 25 years, BWH ranked second in research funding from the National Institutes of Health (NIH) among independent hospitals. BWH continually pushes the boundaries of medicine, including building on its legacy in transplantation by performing a partial face transplant in 2009 and the nation's first full face transplant in 2011. BWH is also home to major landmark epidemiologic population studies, including the Nurses' and Physicians' Health Studies and the Women's Health Initiative. For more information, resources and to follow us on social media, please visit BWH's online newsroom.