Communication problems refers to misunderstandings and misinterpretation of other people's meanings while talking. This is commonplace in relationships between family members, spouses, coworkers, and others.
Depending on the nature of the misunderstanding it can lead to tension and arguments in all kinds of relationships; personal, platonic, intimate, workplace, etc. This happens because the people involved have different experiences and priorities along with different understandings of words and body language.
For example, one friend breaks an appointment to go to the movies because of a headache. The other friend might get their feelings hurt thinking that their friend just doesn't want to see them. These type of problems can be minimized through attempts to communicate clearly and clarifying points that are unclear.