The causes of renal nodular hyperplasia 1.4cm*1.1cm may be inflammatory mass of kidney, kidney tumor and so on. 1. Inflammatory renal mass: when patients have inflammatory renal mass due to various reasons such as trauma, bacterial infection, etc., patients may have inflammatory mass formation, which may be manifested as renal nodular hyperplasia 1.4 cm*1.1 cm. 2. Kidney tumor: when the patient’s kidney develops tumor such as renal fibroma, renal cancer, etc., due to the growth of tumor cells, nodules or masses can be formed, forming occupying changes, so the patient may manifest as renal nodular hyperplasia 1.4cm*1.1cm. When patients have renal nodular hyperplasia 1.4 cm*1.1 cm, they should go to the hospital in time for further examination and treatment under the guidance of professional doctors.