Stomach Cancer

Overview

Stomach cancer, also called gastric cancer, is a disease in which abnormal cells grow in the lining of the stomach. The stomach is part of the digestive system and helps break down food before it moves into the intestines. Stomach cancer can develop slowly over time and may not cause noticeable symptoms in the early stages.

There are different types of stomach cancer. The most common type begins in the inner lining of the stomach. Less common types can start in other tissues of the stomach wall. The location of the tumor, how deeply it has grown, and whether it has spread to nearby lymph nodes or other organs are important factors in planning care.

Stomach cancer is a serious condition, but treatment options have improved. Care is usually provided by a multidisciplinary team, which may include specialists in oncology, surgery, gastroenterology, radiology, pathology, nutrition, and supportive care.

Symptoms

Early stomach cancer may cause no symptoms or only mild digestive discomfort. When symptoms do occur, they can be similar to those caused by more common, non-cancerous conditions. This is why medical evaluation is important if symptoms persist or worsen.

• Indigestion or a burning feeling in the upper abdomen
• Persistent stomach pain or discomfort
• Feeling full after eating small amounts
• Loss of appetite
• Unexplained weight loss
• Nausea or vomiting
• Difficulty swallowing, especially if the tumor is near the upper stomach
• Vomiting blood or material that looks like coffee grounds
• Black or tar-like stools
• Tiredness, weakness, or symptoms related to anemia
• Bloating or a feeling of heaviness after meals

These symptoms do not necessarily mean a person has stomach cancer. However, ongoing or concerning symptoms should be assessed by a healthcare professional.

Causes and Risk Factors

Stomach cancer develops when cells in the stomach undergo changes that allow them to grow and divide abnormally. The exact cause is often not known, but several factors may increase risk.

• Long-term infection with Helicobacter pylori, a common stomach bacterium
• Chronic inflammation of the stomach lining
• A history of stomach polyps or certain stomach conditions
• Smoking
• A diet high in salted, smoked, or preserved foods and low in fresh fruits and vegetables
• Family history of stomach cancer
• Certain inherited genetic conditions
• Previous stomach surgery in some cases
• Older age
• Being male, as stomach cancer is more common in men

Having one or more risk factors does not mean that a person will develop stomach cancer. Some people with stomach cancer have no clear risk factors. Reducing avoidable risks, such as smoking and unhealthy dietary patterns, can support overall health.

Diagnosis

Diagnosis usually begins with a medical history, physical examination, and discussion of symptoms. If stomach cancer is suspected, the doctor may recommend tests to look inside the stomach and collect tissue samples.

An upper endoscopy is a key test. During this procedure, a thin flexible tube with a camera is passed through the mouth to examine the esophagus, stomach, and the first part of the small intestine. If an abnormal area is seen, small samples of tissue can be taken for biopsy. A biopsy is examined under a microscope to confirm whether cancer cells are present.

Additional tests may be used to understand the extent of the disease. These may include imaging scans, ultrasound-based endoscopy, blood tests, and other assessments. The process of determining how far the cancer has grown or spread is called staging. Staging helps the medical team choose the most appropriate treatment approach.

Because stomach cancer can vary greatly from person to person, diagnosis and staging are important steps before any treatment plan is recommended.

Treatment Options

Treatment for stomach cancer depends on several factors, including the cancer’s stage, location, type, the person’s general health, nutritional status, and personal preferences. A multidisciplinary team usually reviews the case and recommends an individualized plan.

Surgery may be considered when the cancer can be removed. Depending on the tumor’s location and extent, surgery may involve removing part or all of the stomach, along with nearby lymph nodes. After stomach surgery, changes in eating habits and nutritional support may be needed.

Systemic treatments may be used to treat cancer cells throughout the body. These can include chemotherapy, targeted therapy, immunotherapy, or a combination of treatments, depending on the cancer’s features and stage. In some cases, treatment is given before surgery to shrink the tumor or after surgery to reduce the risk of recurrence.

Radiation therapy may be recommended in selected situations, often in combination with other treatments. It uses carefully directed energy to target cancer cells in a specific area.

Supportive and palliative care are also important parts of treatment. These services focus on relieving symptoms, supporting nutrition, managing side effects, and improving quality of life at any stage of illness. Palliative care can be provided alongside active cancer treatment.

When to See a Doctor

A doctor should be consulted if digestive symptoms persist, become more frequent, or interfere with daily life. Early medical evaluation can help identify the cause and guide appropriate care.

• Ongoing indigestion, upper abdominal pain, or discomfort
• Unexplained weight loss or loss of appetite
• Feeling full very quickly when eating
• Repeated nausea or vomiting
• Difficulty swallowing
• Vomiting blood or passing black stools
• Unexplained tiredness, weakness, or signs of anemia
• Symptoms that do not improve or continue to return

People with a strong family history of stomach cancer or known risk factors may benefit from discussing screening or monitoring with a healthcare professional. Only a qualified medical team can assess symptoms, recommend tests, and explain the most suitable care options.