Gastric cancer symptoms may include:

abdominal discomfort: persistent pain in the belly area (abdomen), especially in the upper part
unintentional weight loss: significant and unexplained weight loss
loss of appetite: decreased appetite or early satiety when eating
nausea and vomiting: frequent symptoms that may also occur with other digestive issues
fatigue: a feeling of extreme tiredness and general weakness
indigestion or burning sensation: strong heartburn-like feeling
abdominal bloating: fluid buildup in the abdomen, known as ascites
pale stools (acholia) and dark urine (choluria): common signs that the bile ducts are blocked. This can happen when stomach cancer is advanced and has spread to the liver (liver metastases)
vomiting blood: a symptom that occurs in certain cases

Isolated symptoms are not sufficient for a diagnosis. Seek a healthcare professional for proper evaluation.