Whether left kidney cyst with calcification is serious or not depends on the actual situation, especially the size of the cyst needs to be paid attention to. Some small-sized left kidney cysts with calcification are usually less serious and do not require treatment. If the left kidney cyst is larger in size, it is usually more serious. Calcification of left renal cyst usually refers to calcium salt deposition that occurs after the healing of chronic inflammation, and the presence or absence of symptoms and adverse effects need to be assessed in terms of the size of the cyst. If the size of the cyst is small, it usually has no clinical symptoms and will not cause serious consequences; if the size of the left renal cyst is large, it is usually more serious, and may cause some obvious clinical symptoms, such as low back pain, hematuria, proteinuria, abdominal mass, and so on, and after the cyst is enlarged, it may cause high blood pressure, and when the cyst ruptures, it will cause hemorrhage, and so on. After the appearance of left kidney cyst with calcification, you should go to the regular hospital in time to find out whether the cyst continues to grow, and follow the doctor’s instructions for standardized treatment.