At present, many people in society think that if you have kidney disease, you have to avoid salt, and some people go to the market to buy medicinal salt, which is extremely unscientific. Salt plays an important role in human metabolism, and normal people need about 6 to 12 grams of salt daily. Lack of salt can lead to serious consequences, when kidney patients occur edema, hypertension, heart failure after limiting salt intake is beneficial to reduce edema, lower blood pressure, control heart failure has the benefit of general daily control of salt 2 to 3 grams. However, in patients with nephritis, edema does not occur and the requirement for salt is not so strict when blood pressure is normal. Even if the consequences are aggravated by salt, a strong diuretic can solve the problem. Excessive restriction of salt intake can lead to malnutrition, which is not conducive to the recovery of kidney disease and can even aggravate the condition. In fact, the medicinal salt in the market is potassium-containing salt, many kidney disease electrolyte disorders, potassium excretion disorders, the incidence of hyperkalemia is extremely high, excessive blood potassium will inhibit the contraction of the heart muscle, and consumption of medicinal salt can easily lead to cardiac arrest and death. Therefore, some kidney disease experts compare medicine salt to the invisible killer, do not consume it casually.