Jargon: Over-complicated, unfamiliar and/or technical terms.
Emotional barriers: may find it difficult to express their emotions
Lack of attention, interest, distractions, or irrelevance to the receiver.
Differences in perception and viewpoint.
Physical disabilities such as hearing problems or speech difficulties.
Language differences
Expectations: People often hear what they expect to hear rather than what is actually said and jump to incorrect conclusions.
Cultural differences.