Internal thrombosed hemorrhoids are difficult to see with the naked eye. Only when they prolapse and protrude outwards can they be seen. The main reason for this is the fact that the hemorrhoid is located very deep inside the rectum. However, there are symptoms that you can look out for to know whether or not you have internal thrombosed hemorrhoids. Fresh blood on the toilet paper or on the toilet stool is indicative that you might have this condition. Other symptoms that are suggestive of internal thrombosed hemorrhoids are strain and discomfort when experiencing bowel movement.