Fibrous streak foci in the upper lingual segment of the left lung are usually old foci left after the absorption of lung inflammation and tuberculosis, which is an imaging manifestation on chest X-ray or chest CT, and usually do not need special treatment, and need to be rechecked regularly. Some patients may have recurrence, if there are symptoms such as cough, sputum, fever, etc., it is necessary to carry out relevant examinations in time, such as blood tests, imaging tests, tuberculin tests, etc. 1. Pneumonia recurrence: it can be treated with penicillin, cephalosporin, quinolone antibiotics and other drugs, commonly used drugs are amoxicillin, cefoperazone, levofloxacin and other drugs for treatment. 2. Recurrence of tuberculosis: anti-tuberculosis drugs can be used, such as isoniazid, pyrazinamide, streptomycin, rifampicin and other drugs. These drugs above have different degrees of side effects, such as gastrointestinal irritation, allergy, liver and kidney function impairment, etc. In the treatment, they must be used under the guidance of doctors in strict accordance with medical advice.