Flare Up

My colleague commented that i was too hot tempered at times and i was puzzled she commented on this. I do not like to show my temper in workplace unless it is necessary. Maybe she is true. I should curb my temper. I also do not wish to flare up in the office. Am i too hasty in showing temper? I had so much thoughts in my mind this day. My boss was enquring on some urgent work to be done and the manager would like to take a look before forwarding to the relevant parties for consideration. I would like to do a good job and was too careless some occasions. My boss had to remind me to redo it. Well, she is the boss, just have to work on again.