Tuberculosis is a contagious disease that primarily affects the lungs and is transmitted through airborne droplets. It remains a major global problem. The pathogenesis of TB involves inhalation of mycobacteria, interaction with macrophages, and potential proliferation within macrophages. This can lead to granuloma formation and containment of the bacteria. Diagnosis involves tests like Mantoux and sputum smear microscopy. Treatment requires a combination of at least three first-line drugs like isoniazid, rifampicin, pyrazinamide, and ethambutol over a lengthy period.