Calcific tendinitis is a condition characterised by the deposition of calcium hydroxyapatite crystals in the tendons, most commonly affecting the rotator cuff in the shoulder. It is clinically significant as it can cause severe pain, limited range of motion, and functional impairment, often mimicking other shoulder pathologies. A key association is its prevalence in individuals aged 30 to 60 years, and it may lead to complications such as tendon rupture if untreated.