Having Mars in hard aspect to Uranus makes you Rebel. You like to go your own way or no way, don´t you?.
If you have Mars conjunct/opposition/square to Uranus in your birth chart then you are a rebel. Maybe you have been aware about this very early in life.. But you don´t fit into any box. You are here to break the status quo. You are that type of person who likes to turn things upside down and really hates routines. Your personality is sometimes eruptive and reckless.
You have problems to adjust to other people, especially authorities. If you have this aspect in your chart, you don´t like to listen to anyone to tell you what to do, what is best for you. You usually know what you want to do and where you are heading but sometimes you feel misunderstood. If someone (parent, partner, boss, police officer) tells you what to do, it creates lot of resistance in you and you just do the complete opposite of what you have been asked.
Problem with this aspect is that you are on and off person and that makes you very unpredictable. Also people in your surroundings usually don´t know what is going to be your next move. To be even more precise, I have to add that you don´t know it as well . Having this aspect makes you someone who acts on blind impulses. This is not aspect about considering all sides of the story, pros and cons.. Here you just act because you feel that uncontrollable urgue to take the action. That´s why your close people or family must be sometimes very flexible and tolerant to keep up with you.
You are also the person who puts freedom above everything else. This is very important value for you and you are willing to live up to it, even if it means to cut some people off from your life. This aspect in natal chart even this harsh aspect is great in having your own business or being solo entrepreneur. As mentioned at the beginning of this article, you have hard times to respect authorities. That´s why your rebellious nature could be very visible in your mundane job and indeed you might have a problems there.
If you are a woman with this aspect, you are usually very independent and you know how to deal with life and challenging situations. If something or someone is off, you are not afraid to completely change your life. In general, people with this aspect are taken as very brave and sometimes risk takers. You are capable to feel safe in situations which might be considered by others as dangerous. This can be also applicable to your sport activities, you are talented at sports, primarily in competitive ones. Just watch out for frequent injuries which are side effects of this birth chart aspect.