Stomach Cancer - Symptoms:
Painful or burning sensation in the abdomen
Heartburn or indigestion (dyspepsia)
Feeling of fullness even after a small meal
Nausea and/or vomiting
Loss of appetite and/or weight loss
abdominal swelling
unexplained tiredness or weakness
blood in vomit
Black stools.

Stomach Cancer - Risk factors:
Scientists have found several risk factors that increase a person's likelihood of developing stomach cancer. Some of these are controllable while others are not.
For example:
Gender
Age
Ethnicity
Geography
Being overweight or obese
Alcohol and tobacco use
Whether or not to have gastric surgery
some stomach polyps
family history of stomach cancer
Specific Professions

Stomach Cancer - Ways of Prevention:
Limit the amount of alcohol you drink and don't use tobacco products.
Avoid eating smoked and pickled foods, salty meat and fish.
Eat plenty of whole grain foods such as fresh fruits and vegetables and whole grain breads, cereals, pasta and rice.
Maintain your healthy weight.