The characteristics of focal tuberculosis mainly include clinical manifestations and corresponding special examinations. The clinical manifestations are mainly pain and chest tightness at the lung projection site of the local lesion, and some patients may experience coughing, coughing up sputum and coughing up blood. In addition, X-rays of both lungs or CT or MRI examinations can reveal relatively limited focal areas of tuberculosis, which appear as patchy, high-density dense shadows. Some patients may also have localized emphysema, cavity formation, or even inflammatory pseudotumors in the form of round or round-like nodules.