Dietary precautions for renal cancer

Written by Zou De Bo
Urology
Updated on September 28, 2024
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Kidney cancer patients should be cautious with their diet and there are three types of food they should absolutely avoid:

First, foods high in salt. Kidney cancer patients often suffer from severe kidney dysfunction, leading to edema. Consuming salty foods can increase the body's sodium content, causing sodium retention which is not metabolized in time, exacerbating the swelling.

Second, high-fat foods. Excessive fat can also lead to weight gain, and high body fat can burden the kidneys.

Third, foods high in potassium. With kidney cancer, patients often have inadequate kidney function and produce less urine, leading to high levels of potassium in the body. Consuming foods high in potassium can further increase blood potassium levels. Therefore, it's advisable for kidney cancer patients to avoid fruits and vegetables high in potassium.

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What are the characteristic manifestations of kidney cancer?

Kidney cancer is a type of malignant tumor. Patients with this disease may exhibit some clinical symptoms. Some patients experience dull pain in the lumbar and back area due to the large growth of the tumor, which compresses the renal capsule. As the tumor grows, it may rupture and bleed, causing the patient to have visible blood in the urine. This type of hematuria is often painless and consistent throughout; patients may also feel a mass in the abdomen. In the early stages of kidney cancer, many patients do not exhibit clinical manifestations or discomfort. Therefore, patients often only exhibit the aforementioned clinical symptoms in a more severe state, later in the progression of the disease.

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Kidney cancer thrombus

Tumor thrombus is one of the common complications of tumors, and refers to cancer cells in blood vessels or lymphatic vessels similar to blood clots, i.e., cancer cells clustering together, invading the vessels, and causing abnormalities in blood coagulation function, leading to disorders in blood circulation and abnormal coagulation with clustered cancer cells. Generally, the risk of tumor thrombus formation is very high, and patients with tumor thrombus have much worse treatment outcomes than those without. Renal cancer is also a tumor commonly associated with tumor thrombus. Once a tumor thrombus occurs, it indicates that the surgery might be staged quite late, and thus, its treatment results are also relatively poor.

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Is vomiting severe in renal cancer?

Patients with kidney cancer who experience vomiting are facing a serious situation because nausea and vomiting are common symptoms among late-stage cancer patients and are often more distressing than the pain from cancer itself. Nausea and vomiting may be side effects of treatment, or they might be caused by cancer invading the digestive and nervous systems. People who are ill often feel anxious, which is also one of the reasons causing vomiting. Cancer patients need to pay extra attention to their diet, as this can greatly aid their treatment. In daily life, it is beneficial to consume more fresh fruits, vegetables, whole grains, and legumes, focusing on light meals to ensure a balanced diet and supplement various nutrients.

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The typical three major symptoms of kidney cancer

The typical three major symptoms of kidney cancer are hematuria, pain, and a mass. If these three symptoms appear, it generally indicates that the condition has reached an advanced stage, at which point the patient may have missed the optimal timing for treatment. Surgery at this stage may also be challenging to perform completely. Therefore, early detection and treatment are essential. The five-year survival rate after kidney cancer surgery is as high as 97% for many people. Thus, overall, the prognosis for kidney cancer is relatively good. However, the best treatment approach remains surgery, including nephron-sparing surgery and radical nephrectomy, depending on the size of the tumor. Generally, for tumors smaller than four centimeters, nephron-sparing treatment can be adopted.

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What are the characteristic symptoms of kidney cancer?

Most kidney cancer patients are discovered during health check-ups, and these patients may account for over 50%-60% of all kidney cancer cases. Among those with symptoms, the most common symptoms are lower back pain and blood in urine. A few patients also present with abdominal masses. 10%-40% of patients can exhibit paraneoplastic syndromes, manifested as high blood pressure, anemia, weight loss, cachexia, fever, abnormal liver function, hyperglycemia, increased erythrocyte sedimentation rate, and other changes. Additionally, symptoms such as bone pain, fractures, cough, and coughing blood can occur due to tumor metastasis.