Urea is not a salt, urea is a product of protein metabolism in the body. Urea is also known as urea nitrogen, it is a kind of metabolic waste in the body, generally the amount of urea nitrogen value as an important indicator of kidney function, if the patient’s urea is elevated, you can consider the possible existence of renal failure, and salt mainly contains sodium chloride, potassium chloride and other components, it exists in the form of sodium ions in the body. If urea is elevated and the patient is diagnosed with renal failure, the patient should not eat more salt, if more salt is eaten, it will cause water and sodium retention, edema, hypertension and other complications. So urea nitrogen is not salt, and patients with elevated uric acid should eat less salt, otherwise it will aggravate the condition.