Left pleural thickening is generally categorized into mild and severe. In case of mild left pleural thickening, it usually does not require treatment, but in case of severe left pleural thickening it should be treated with timely surgical intervention. Mild left pleural thickening, which can also be described as localized pleural thickening, mostly does not require special treatment. Most patients with mild left-sided pleural thickening can relieve symptoms such as chest tightness after appropriate lung capacity and lung function exercises. However, if the thickening and adhesion of the left pleura is caused by diseases such as tuberculosis or lung malignant tumor, the original disease needs to be actively treated, and at the same time, the pleural thickening should also be treated. If the symptoms of pleural adhesion are serious, it should be treated surgically, and pleurodesis can be done. If left-sided pleural thickening occurs, you should consult a professional doctor in time to understand the degree of development of the disease in detail, and choose the appropriate treatment method under the doctor’s advice to avoid delaying the disease.