Breathing, Lung Function and Bronchitis: 7 Things You Need to Know — From Spirometry to Pranayama to the Antibiotic Myth

This article provides an evidence-grounded overview of pulmonary anatomy, breathing mechanics, and the diagnostic and clinical landscape of bronchitis, synthesised from current clinical guidelines, StatPearls physiology reviews, a 2025 American Family Physician rapid evidence review of acute bronchitis, CDC and NCQA data on antibiotic prescribing patterns, and a published meta-analysis of yoga and pranayama's effects on spirometry outcomes. It documents the two-mechanism distinction between acute bronchitis (viral, self-limiting, antibiotic-inappropriate) and chronic bronchitis (a component of COPD driven by sustained inhalant exposure), explains key spirometry parameters in accessible terms, and places these modern clinical frameworks in dialogue with Ayurveda's classical descriptions of Tamaka Shwasa and Kaphaja Kasa from Charaka Samhita and Ashtanga Hridayam. The article includes a randomised trial evidence review of pranayama's effect on FVC, FEV1, and peak expiratory flow rate, and closes with a practical, evidence-bound framework for protecting and strengthening pulmonary health across different life stages. The governing thesis: the lungs are dynamic, trainable organs whose health depends as much on what you practise daily as on what you avoid — and the evidence from both modern spirometry research and classical Indian respiratory medicine independently confirms that breathing deliberately, in structured patterns, measurably changes lung function over time.