Nephrosis is a degenerative kidney disease where the kidneys start to lose function over time. It can be caused by defects in the glomeruli or be secondary to other conditions like diabetes or hypertension that damage the kidneys. Symptoms include swelling in the face and legs from fluid retention, protein in the urine, high cholesterol, and low blood protein. Treatments may include medications to reduce inflammation, antibiotics for infection, dialysis for kidney failure, and following a low-salt, low-fat diet with exercise.