Respiratory Health Risks in Hairdressing: A Cross-sectional Study of Occupational Subgroups

Occupational exposure in hairdressing is associated with significant respiratory health risks, including impaired lung function and respiratory symptoms. This study aimed to evaluate and compare respiratory symptoms and pulmonary function across subgroups of hairdressers categorized by their specific exposure profiles. A cross-sectional analysis was conducted involving 152 female hairdressers in Tehran, Iran, who were stratified into four subgroups: (1) individuals with direct exposure to hair dyes, dechlorinating agents, and keratinizing substances; (2) individuals exposed to varnish, acetone, and nail implant materials; (3) individuals exposed to adhesives for hair and eyelash extensions; and (4) individuals with minimal or no direct chemical exposure. Respiratory and nasal symptoms were assessed using the European Community Respiratory Health Survey (ECRHS) III questionnaire. spirometry measurements, including forced vital capacity (FVC), forced expiratory volume in one second (FEV1), FEV1/FVC ratio, and forced expiratory flow at 25-75% of FVC (FEF25-75), were performed to evaluate pulmonary function. Overall, 42.1% of participants reported respiratory symptoms, with subgroup 1 exhibiting the highest prevalence. Cough (64.3%), wheezing (35.7%), and dyspnea (64.3%) were the most commonly reported symptoms, while 22.4% reported nasal symptoms. Subgroup 1 demonstrated significantly lower pulmonary function indices and a higher prevalence of obstructive lung patterns (40.5%). Bronchodilator responsiveness indicative of asthma was observed in 34.2% of participants. In conclusion, direct occupational exposure to hairdressing chemicals, particularly hair dyes and bleaching agents, is associated with substantial respiratory impairment. Implementation of regular health surveillance, personal protective equipment, and enhanced workplace ventilation is strongly recommended.