Barriers to communication can occur at any point in the communication process and hinder the proper understanding of messages. The document discusses several common barriers including physical barriers like noise; psychological barriers like emotions; semantic barriers due to differences in language; personal barriers such as attitudes; organizational barriers related to hierarchy; social barriers involving relationships; cultural barriers from differing perspectives; and ethical barriers when moral issues are ignored. Overcoming barriers requires minimizing distractions, considering the audience, using clear language, and obtaining feedback to confirm the intended message was received.