Stomach cancer self-test action is not real. Gastric cancer cannot be diagnosed by self-test. The diagnosis of gastric cancer is mainly based on clinical symptoms, laboratory and imaging tests, gastroscopy, histopathological examination and so on. 1. Clinical symptoms: Stomach cancer will lead to symptoms in human digestive tract, such as abdominal pain, bloating, loss of appetite, black stools, etc., which need to be further examined by gastroscopy. 2. Laboratory and imaging examination: through laboratory and imaging examinations such as CT scan, MRI examination, etc., the specific condition of the patient’s stomach can be observed, whether there are symptoms such as thickening of stomach wall and mass in the cavity. 3. Gastroscopy: gastroscopy can visualize the gastric mucosa and observe the size and scope of the lesion as well as the presence of ulcer formation. 4. Histopathological examination: take part of biopsy tissue and conduct pathological slice examination to clarify the disease. The action of stomach cancer self-test not only cannot confirm the diagnosis of stomach cancer, but also may cause misjudgment of the condition and delay the treatment. Therefore, if you have stomach discomfort or other symptoms, you should go to the hospital at the first time to complete relevant examinations to clarify the disease and take surgery to remove the lesions under the guidance of doctors to avoid the spread of cancer cells.