How is pulmonary tuberculosis caused?

Tuberculosis (TB) is a chronic infectious disease caused by *Mycobacterium tuberculosis*, capable of affecting many organs in the body—especially the lungs. In the early stage of *M. tuberculosis* infection, active disease may not develop immediately; however, when the body’s immune defenses weaken, pulmonary tuberculosis can readily occur. So, what causes pulmonary tuberculosis?

What Causes Pulmonary Tuberculosis?

Pulmonary tuberculosis is primarily a chronic infectious disease caused by *Mycobacterium tuberculosis*. Its characteristic pathological features include tuberculous granulomas and caseous necrosis, and cavitation frequently develops. Most cases follow a chronic course, while a minority present acutely. Systemic symptoms—such as low-grade fever and fatigue—are common, along with respiratory manifestations—including cough and hemoptysis. Primary pulmonary tuberculosis, also known as childhood tuberculosis, is the predominant form in infants and represents the first infection following initial exposure to the pathogen.

Treatment of pulmonary tuberculosis is predominantly pharmacological, with the main goals being to shorten the infectious period and reduce mortality. Antitubercular drugs constitute the cornerstone of therapy; however, they must be initiated promptly and used rationally. Patients require appropriate combination therapy, and drug dosages must be carefully calibrated—not excessively high. Close clinical monitoring is essential throughout treatment, and the standard duration of therapy typically ranges from six to nine months. Strict adherence to the full prescribed regimen is mandatory; when these principles are followed, treatment success rates reach up to 98%.

In daily life, patients should maintain a regular, balanced diet—avoiding spicy, irritating, or overly rich foods—and refrain from binge eating or staying up late. We hope this information proves helpful.