Primary Ciliary Dyskinesia (PCD) is a rare genetic disorder that affects the cilia, which are tiny hair-like structures on the surface of cells. These cilia play a crucial role in moving mucus and clearing debris from the respiratory tract. In individuals with PCD, the cilia do not function properly, leading to chronic respiratory issues, frequent infections, and other complications. PCD can also impact other organs, such as the ears and sinuses, and may result in hearing loss or sinusitis. Diagnosis typically involves specialized tests, including nasal nitric oxide measurement and genetic testing. Early detection and management are essential for improving quality of life for those affected.