std symptoms?

I don't know if this is a symptom but I have seen a change in color and smell in my urine. The color is dark and cloudy and it smells very, very strong. Is this a sign of an std? It's been going on for over a year now and I've gone to the doctor and had tests since then but they only said I had urinary tract infections and and gave me antibiotics. It goes away for a bit but it comes back.  What should I do?

[diamond1985]

it can be a std.when u went to the doctor did u get a full blood-work? are u having unpretected sex? it can be a urinary tract infections.and if  your having unpretected sex with anyone,they can also get it.and if they not treated and u are treat.and if u have unpretected sex with that person. u can also get  urinary tract infection again. the best thing for u to do is, if your having unpretected sex, u and your sex partner  should get treat.but make sure u see the doctor as soon as possible.

[segnarts]

Thanks you for your post. What std could it be? And when I got tested the first time they did only a urine sample. But I had gotten into a car accident and had blood taken and they told me at the hospital I had a urinary tract infection. If I had something then would they have told me?