Patients with gastric cancer who cough up blood need to consider whether there is advanced lung metastasis. To confirm the diagnosis, a chest CT is needed, and it may be simple lung inflammation, at which time patients need to take anti-inflammatory and anti-infection treatment, and the symptoms can be improved. Coughing up blood is also known as coughing up blood in medicine, which usually refers to the process of bleeding from the respiratory organs below the larynx, such as the trachea, bronchi and lung tissues, and is expelled from the mouth by the coughing action. If it is clear that it is gastric metastasis and belongs to advanced stage of gastric cancer, systemic treatment, such as chemotherapy, radiotherapy, immunotherapy, targeted therapy, and even Chinese medicine and other therapeutic means should be carried out.