my grandpa died last night, he was watching the news and what happened was his lungs exploded. Blood came out of his mouth really bad. He had been a heavy chain smoker but didnt have lung cancer. He had a tumor on his brain and he was going for surgery for that this morning. He had throat cancer and had radiation about a month ago so I just wanted to know how or what causes your lungs to explode and did he feel anything?
Thank you



*very concerned*