Background: One of the most common complications of renal obstructive disease is hydronephrosis. It can lead to serious complications, including acute and chronic renal failure, if left untreated. Objective(s): To recognise factors overlooked in mild hydronephrosis. To demonstrate changes in ultrasound among patients with hydronephrosis. To ensure prompt ultrasound diagnosis leading to acute and chronic renal failure. Material and method: This is a descriptive cross-sectional study. The participants in this sample were 56 females and 44 males who went to the ultrasound department. Patients gave their informed consent to be scanned for trans-abdominal ultrasound. A specially crafted data collection sheet was developed to contain the patient's demographic statistics. Renal ultrasound has been the gold standard for kidney imaging. It is possible to picture and evaluate renal pelvic-calyceal system. A real-time machine with a 3.5 MHz, TA, convex transducer was used to conduct the ultrasound test. The renal pelvis and calyces were seen during longitudinal and transverse sections through the kidneys. When the renal pelvis and calyces dilate, it is easy to diagnose hydronephrosis. Statistical analysis was done for windows using version 22 of the standard social sciences statistical package (SPSS). Results: Hydronephrosis was categorised into mild, moderate, medium, and serious hydronephrosis based on its sonographic appearance. Mild hydronephrosis is the most common (56%), followed by moderate (25%), serious (13%), and extreme (6%). Ureteric stone, kidney stone, pregnancy, and benign prostatic hypertrophy were among the causes of hydronephrosis. Conclusion: The sensitivity of ultrasound is high to rule out grades of hydronephrosis and determining the root causes. The purpose of study is to have the information about neglected variables in mild state, so that exact causes of its prevalence can be timely sorted.