Is gastric cancer contagious?

Written by Ren Zheng Xin

Gastroenterology

Updated on January 03, 2025

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Gastric cancer is a malignant tumor occurring in the epithelial cells of the gastric mucosa. It is non-contagious. Currently, the incidence of gastric cancer is relatively high, primarily due to Helicobacter pylori infection, adverse environmental factors, and dietary irritants. Genetic factors also play a significant role, with 10% of gastric cancer patients having a family history. Those with a family history of gastric cancer have an incidence rate that is 2 to 3 times higher than the general population. Additionally, precancerous lesions can also induce gastric cancer, such as intestinal metaplasia, gastric polyps, residual gastritis, and gastric ulcers. Typical symptoms include indigestion, anemia, lack of appetite, aversion to food, and fatigue. Currently, gastroscopy combined with mucosal biopsy is the most reliable diagnostic method.

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Symptoms of gastric cancer

Symptoms of gastric cancer include nausea, vomiting, acid reflux, pain in the upper abdomen, and a sense of fullness and discomfort, especially after eating, which are some of the early symptoms. As the tumor progresses, symptoms can worsen, including pain, vomiting of blood, and black stools indicating upper gastrointestinal bleeding. If the tumor is near the pylorus, it can cause pyloric obstruction, which manifests as acid reflux followed by vomiting of undigested food from the previous night. In the late stages of gastric cancer, patients may experience fatigue, weight loss, severe cachexia, and anemia. These are symptoms of advanced gastric cancer.

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How to treat advanced gastric cancer?

The treatment for advanced gastric cancer is primarily chemotherapy, especially for patients with peritoneal or retroperitoneal lymph node metastasis, or distant organ metastasis such as to the liver or lungs. The treatment primarily involves chemotherapy, specifically choosing either multi-drug intravenous combination chemotherapy or oral monotherapy, such as oral chemotherapy with tegafur capsules, or broad-spectrum targeted therapies like apatinib that inhibit angiogenesis. The choice of treatment depends on a comprehensive consideration of the patient's overall condition. If the patient's general condition is particularly poor and the chemotherapy risk is assessed to be high, then the approach for such advanced-stage patients is primarily the best symptomatic supportive treatment to alleviate suffering as much as possible. Therefore, the treatment plan must be determined based on a comprehensive consideration of the specific situation.

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What are the symptoms of stomach cancer?

Gastric cancer can cause pain in the upper abdomen. If the condition gradually worsens, it can manifest as persistent pain, postprandial fullness and vomiting, belching, and lack of appetite; upper gastrointestinal bleeding, manifesting as vomiting blood, blood in the stool, and black stools; there can also be difficulty swallowing, weight loss and anemia. If bone metastasis occurs, it can manifest as bone pain and pain in the lower back. If a large amount of ascites appears, it can lead to abdominal distension, with shifting dullness detectable on percussion. If liver metastasis occurs, it can manifest as jaundice, and enlargement of the supraclavicular lymph nodes can also occur.

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Can stomach cancer be cured?

Whether gastric cancer can be cured depends on the stage of the cancer, as well as the patient's own physical condition. For example, early-stage gastric cancer patients, who are diagnosed as early-stage through examinations such as endoscopic ultrasonography and enhanced CT of the chest and abdomen, and assessed by surgeons as suitable for curative surgery, are primarily treated with curative surgery. The prognosis for these early-stage gastric cancer patients is generally good, with a relatively high five-year survival rate. Post-operation, based on the pathological findings, it is decided whether postoperative adjuvant radiotherapy and chemotherapy are necessary. There is hope for curing patients in these early stages through these treatment methods. However, if a patient is found to have advanced-stage gastric cancer, for example with metastases to distant organs like the liver and lungs, the cancer is not completely curable. The purpose of treatment in such cases is to alleviate the patient's pain and extend their survival, but it can’t achieve a curative effect.

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Early symptoms of gastric cancer

The symptoms of early gastric cancer are nonspecific and similar to those of chronic gastritis, gastric ulcers, gastroparesis, and other benign diseases, making it difficult to distinguish. Screening data shows that 40%-60% of patients with early gastric cancer are asymptomatic. The symptoms of early gastric cancer primarily include pain or discomfort in the upper abdomen, loss of appetite, fatigue, vomiting, hematemesis, blood in stools, melena, and difficulty swallowing. Discomfort in the upper abdomen is the most common symptom, followed by pain beneath the sternum. Generally, early gastric cancer does not present specific physical signs, though tenderness in the upper abdomen is relatively common, and some patients may exhibit signs of anemia.