Dreaming about fighting is often a sign of emotional turmoil of some sort, and this is the case whether you are arguing with others in your dream or not. You may have some cues about someone in your waking life, and experience arguing and fighting with them in your dream life. This suggests you are experiencing emotional turmoil about this person, and examining their role in your waking life. If this fighting in your dream is the kind where you will fight until someone or something is dead, then some old habits or relationships in your waking life need to be re-examined.
You may also be experiencing a refusal to acknowledge your role in current problems and situations in your life. If on the other hand you are seeing others fight in your dream, and you are not a part of it, this suggests conflict around you that you are not aware of. It could also indicate that there is fighting around you in your life that you do know about, but you are feeling like having a standoff approach would be better. Is it really though? This is the question you want to ask yourself in this case. Intervening or acting as a portal of love to those that are fighting in your dream world could create a change in relationships in your life for the better.