Why does stomach cancer cause loss of appetite?

A growth in the stomach can irritate its inner surface or narrow part of the passage used by food. Eating may then bring early fullness, discomfort, bloating, nausea, or a feeling that food is sitting heavily. Illness-related inflammation can also alter appetite and energy. Loss of Appetite is a common presentation of Stomach Cancer, but loss of appetite has many other possible causes, including infection, medicines, stress, and digestive conditions.

A change that lasts, is getting worse, or occurs with unplanned weight loss deserves assessment. The pattern matters: note whether smaller meals feel difficult, whether nausea follows meals, and whether certain foods trigger discomfort.

Arrange a medical appointment for a persistent appetite change. Until then, choose small, regular meals and drinks you can tolerate, and keep a brief record of appetite, weight change, pain, vomiting, bowel changes, and medicines. Do not force large meals when they make symptoms worse. A clinician may review your symptoms, examine your abdomen, and decide whether blood tests, imaging, or a camera examination of the stomach is appropriate.

Seek urgent medical help for vomit containing blood, black or tar-like stools, severe or worsening abdominal pain, repeated vomiting, fainting, confusion, or an inability to keep fluids down. Contact a clinician promptly if appetite loss comes with trouble swallowing, increasing tiredness, yellowing of the skin or eyes, or noticeable weight loss.

Ask what may be contributing to the appetite change, whether your other symptoms suggest a stomach problem, which tests could clarify the cause, and how to maintain food and fluid intake while you wait. Bring a list of medicines and any family history of stomach or digestive cancers.