Previous studies and meta-analyses suggest an association between hypertension and tinnitus; however, the influence of hypertension severity and control status remains unclear.

We aimed to investigate the association between hypertension and tinnitus in detail using a large, population-based dataset from a rural setting.

Design

Observational cross-sectional study.

Setting

Sheshdeh, Fasa, Iran.

We analysed data from 9775 individuals in the general population, aged 35–70 years, excluding those with a history of cancer, pregnancy or medical conditions known to cause tinnitus, such as stroke, seizures or multiple sclerosis. Additionally, although the study design aimed to exclude participants using aminoglycosides because of their significant ototoxic effects, no such users were identified during the study period.

Hypertension was defined as a systolic blood pressure (SBP) of ≥140 mm Hg or a diastolic blood pressure (DBP) of ≥90 mm Hg on at least two separate measurements or as current use of antihypertensive medications following a prior diagnosis. These medications included ACE inhibitors, angiotensin receptor blockers, diuretics, aldosterone antagonists and atenolol. Stage I hypertension was classified as an SBP of 140–159 mm Hg or a DBP of 90–99 mm Hg, while stage II was defined as an SBP of ≥160 mm Hg or a DBP of ≥100 mm Hg. Controlled blood pressure was defined as values below these thresholds. Tinnitus, assessed by a self-reported questionnaire, was defined as a continuous wheezing sound in the ear persisting for more than 1 week.

Among participants (4446 males, 5309 females; mean age 48.55 (SD 9.53) years), the prevalence of tinnitus and hypertension was 7.4% and 19.3%, respectively. Hypertension was significantly associated with higher odds of tinnitus (adjusted OR=1.34; 95% CI 1.10 to 1.62). Notably, even participants with controlled hypertension had a 27% increased odds (OR=1.27; 95% CI 1.02 to 1.59) compared with normotensive individuals. The odds were highest in those with uncontrolled grade II hypertension (OR=2.08; 95% CI 1.25 to 3.47), demonstrating a dose-response relationship.

Our findings suggest a positive association between hypertension and tinnitus, with odds increasing alongside the severity and poor control of hypertension. Importantly, even controlled hypertension was associated with elevated odds, indicating that tinnitus screening may be warranted in all hypertensive patients, regardless of control status. These results underscore the need for heightened clinical awareness and further research into the pathophysiological mechanisms linking vascular health and auditory symptoms.

This systematic review and meta-analysis aimed to determine the prevalence, patterns and associated factors of complementary and alternative medicine (CAM) use among pregnant women in Iran.

A systematic review and meta-analysis of observational studies.

A comprehensive search was conducted in PubMed/MEDLINE, Web of Science, Scopus, ScienceDirect and major Iranian databases from inception to 30 November 2024.

We included observational studies published in peer-reviewed journals that assessed CAM use among pregnant women in Iran and reported prevalence estimates or relevant associated factors.

Data extraction and quality assessment were performed independently by two reviewers using a standardised form and the Quality Assessment Tool. Meta-analyses of proportions were performed using the DerSimonian and Laird random effects model. The between-study heterogeneity was assessed using the I-squared (I²) statistic. Subgroup analysis, 95% prediction intervals (95% PrIs) and sensitivity analysis were conducted to explore the sources of heterogeneity and to evaluate the robustness of the overall effects, respectively. This study followed Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines and was registered with PROSPERO.

20 studies with a total of 8106 participants were included. The pooled prevalence of CAM use was 49% (95% CI 39% to 59%). The between-study heterogeneity was very high (I²=94.69%) with a wide 95% PrIs range of 3%–94%. The very high between-study heterogeneity and the wide range of PrI for the pooled prevalence were not explained by the quality of the studies, geographical regions of Iran or the methods of data collection. Mentha longifolia, Zataria multiflora and Boswellia thurifera were the most commonly used herbs. Across the included studies, the first trimester of pregnancy was most frequently reported as the period of CAM use, with socioeconomic factors identified as significant predictors. Family and friends were the primary sources of information regarding CAM. The most common reasons for CAM use included gastrointestinal issues, respiratory problems such as colds and coughs, and the desire to improve general health. Only 31% of participants disclosed their use of CAM to their healthcare provider.

Nearly half of pregnant women in Iran use CAM, yet disclosure to healthcare providers is low. An actionable implication is the critical need to integrate routine enquiry about CAM use into standard antenatal care to ensure safe practice. Further research is recommended to evaluate the effectiveness, safety and outcomes of CAM use among pregnant women.

CRD42024618490