Brown blood is generally a sign that it is old blood. It is impossible to tell what that can mean exactly unless it is known where the brown blood is found. In females, brown blood is often found before or after a period, and simply signals that the blood is older and just being expelled. This can come from a cyst or small amounts of blood left after menstruation. Again, it is impossible to say for sure without specifics. If you experience a lot of brown blood, it is best to consult a doctor to find out for sure what is going on. A doctor will be ale to conduct tests and take a look to ensure everything is normal and there is nothing to worry about.