The symptoms of internal bleeding can vary from one case to the next. It can be sudden and rapid with extreme pain, shock, and fainting. Or, it can be slow and “silent” with few symptoms until the total loss of blood is extreme.
With that said, the symptoms don’t always reflect the amount of bleeding and its severity. Large amounts of blood may be lost following an abdominal or kidney injury before symptoms appear. By contrast, even small amounts of bleeding in parts of the brain can cause major symptoms and even death.