Patients with prostate cancer may experience vomiting due to the metastasis of the disease to the liver, causing damage to liver function. However, vomiting could also be caused by other reasons, such as the metastasis of prostate cancer to the peritoneum of the abdominal cavity. Clinically, this can lead to cancerous intestinal obstruction, with symptoms commonly including vomiting, abdominal pain, bloating, reduced bowel movements and gas, or cessation of bowel movements and gas. When prostate cancer metastasizes to the brain, the increased intracranial pressure can also cause symptoms such as vomiting, headache, swelling of the optic disc, hemiplegia, and aphasia. Additionally, some prostate cancer patients may experience vomiting due to toxic side effects from treatments such as chemotherapy and targeted therapy.