The colour of internal haemorrhoids is usually bright red. Bleeding from internal haemorrhoids can manifest as rubbing blood after a stool, dripping blood after a stool or jet-like bleeding that stops on its own after a stool.
If there are clinical manifestations such as dark red colour, mucus and blood stools, pus and blood stools or a combination of abdominal pain and bloating, you need to go to the hospital and have a complete colonoscopy, abdominal CT and other tests to clarify the cause.