External communication barriers are things such as noise, poor lighting, heat or cold or uncomfortable seating.  Noise may make it difficult to hear or read or focus on a message.  Poor lighting, a room that is too cold or warm and an uncomfortable chair are examples of physical barriers that can distract a sender or receiver and hinder communication.  Language can also be an external communication barrier.  When the sender and receiver do not speak the same language, it is difficult for communication to take place.