Whether polycystic kidney can eat crayfish mainly depends on whether its kidney function is normal. If the patient is in the early stage of the disease and does not have impaired renal function, it can be consumed in moderation; if the patient has renal insufficiency or combined hyperkalemia, it is not recommended that the patient consume it. Polycystic kidney in the early stage of the disease usually has no special clinical manifestations, the patient has no edema, no hypertension, and the laboratory renal function is usually within the normal range. Therefore, there are no special requirements in diet, the main component of crayfish is protein, patients can eat in moderation. However, with the progress of the disease, polycystic kidney patients may have uremia, hypertension and other complications, renal function then gradually decline, crayfish contains potassium ions, when consuming too much crayfish, may lead to more and more potassium ions in the body, if you can’t get out of the body in time, it may lead to or exacerbate hyperkalemia, the serious cases can be life-threatening, at this time, it is not recommended that patients eat. Polycystic kidney patients are recommended to go to the regular hospital in time, under the guidance of the doctor standardized treatment.