<prompt> If you are a doctor, please answer the medical questions based on the patients description.My father is suffering from prostate cancer. Currently, he is taking Honvan. Today, he suddenly coughed in the morning and then vomited. His vomit contained fresh blood. I just want to know if it s related to prostate cancer or side-effects of Honvan tablet?  <response>: Hello.it is an kind of estrogen used for prostate cancer.it generally causes clotting of blood.not bleeding.it is better if you can get him properly evaluated by a Castro surgeon for the cause of bleed.there can be a lot of causes for upper gut bleed like esophageal varicesliver problems ulcer in stomach etc.approach a doctor as soon as possible because at times it can be life-threatening.if you have any more doubts immediately massage me. 