Fibrotic foci in the upper lobe of the left lung are treated differently depending on the cause of the disease, such as inflammation of the lungs and tuberculosis, and are usually treated with medication. 1. Fibrotic foci can be caused by progressive, widespread inflammation in the lungs or by residual inflammation. When they are small, no treatment is usually needed. When they are more extensive, medications are used depending on the cause. For bacterial infections, antibiotics such as cephalosporins are given orally or intravenously. For viral infections, antiviral drugs such as ribavirin are given. 2. Tuberculosis can also cause fibrous foci in the lungs, and is usually treated with anti-tuberculosis drugs such as isoniazid, rifampicin, kanamycin, amikacin, etc., after sputum culture of tuberculosis bacilli confirms the diagnosis. Attention is paid to early, standardized, appropriate dosage, full course, and combination medication. It should be noted that if the symptoms do not improve or worsen, it is necessary to go to the hospital in time, and the medication should be rationally applied according to the doctor’s prescription.