So, nephrotic syndrome is a general term for a group of clinical symptoms, a state of disease, and is not essentially an independent disease. Thus, this problem is not infectious. This disease describes the damage to the kidneys due to some reason, leading to the disruption of the integrity of the glomerular filtration barrier, resulting in the patient developing a significant amount of urinary protein. The disease itself is not contagious. However, there are very few cases of nephrotic syndrome that might be caused by hepatitis B virus infecting the kidneys. In such cases, the hepatitis B virus may have a certain level of contagiousness, but even so, it does not imply that nephrotic syndrome itself is contagious. In other words, even if such patients transmit hepatitis B to others, it does not necessarily mean those others will exhibit kidney damage.