Gastric cancer is a type of cancer that starts in the cells that make up the lining of the stomach. Stomach cancer is a serious disease that requires careful examination and comprehensive treatment. In this article, we will discuss everything from diagnosis to prevention and treatment of stomach cancer.

1. Diagnosis and examination:
   1.1 Signs and symptoms:
   Stomach cancer usually starts without obvious symptoms in the early stages. However, some symptoms may appear later, such as unexplained weight loss, difficulty swallowing, rapid satiety, abdominal pain, and discomfort.

1.2 Diagnostic tests:
Computer tomography (CT scan) and magnetic resonance imaging (MRI).
Surgery to remove tissue samples for analysis.
Gastrointestinal endoscopy (endoscopy) direct examination of the stomach.

2. Causes of stomach cancer:
   2.1 Genetic factors:
   Your risk increases if you have a family history of stomach cancer.

2.2 Environmental factors:
Exposure to hazardous chemicals at work or in the environment.

2.3 Helicobacter pylori stomach infection:
These bacteria play an important role in the development of stomach cancer.

2.4 Nutrition:
A diet low in fruits, vegetables, and salty and smoked foods increases the risk of infection.

3. Prevention and preventive measures:
   3.1 Lifestyle changes:
   Following a healthy diet and avoiding smoking and drinking alcohol can reduce the risk.

3.2 Regular inspection:
People with risk factors, such as a family history of stomach cancer, should be screened regularly.

3.3 Treatment of Helicobacter pylori infection:
If an infection is found, it is treated with antibiotics to reduce the risk of developing stomach cancer.

4. Medical treatment and measures:
   4.1 Surgery:
   Surgery is one of the most important treatment methods because it removes the tissue affected by the tumor.

4.2 Chemotherapy and radiation:
Chemotherapy and radiation are used to control tumor growth and kill cancer cells.

4.3 Targeted therapy:
Targeted drugs are used to target specific properties of cancer cells.

Stomach cancer is a serious health problem that requires early diagnosis and comprehensive treatment. Prevention and regular health care plays an important role in reducing the spread of this disease. Therefore, individuals should stay away from dangerous factors, adopt a healthy lifestyle, and contribute to the prevention of stomach cancer.