Mercury square Mars

What does Mercury square Mars mean in the natal chart?

Your Mercury and Mars pull against each other, giving your mind a fast, fighting edge. You think quickly, speak with a bite, and find yourself in more arguments than you meant to start. The hard part is the line you fire off in heat that slams a door shut, then leaves you unsure how to open it again. When you can slow the half-second before you speak, that same quickness becomes sharp, honest, and quick to defend what matters.