Protein within the urine?

My dr. told me I have traces of protein in my urine. Tests for diabetes and I also am negative for a bladder infection. Other than kidney disease (which I don't focus I have) what could be causing this? I eat the right amount of protein for some one my age. Oh-and I drink 8-10 cups of water a daytime, so I'm drinking enough water.
Answers:
This pathological condition is called Proteinuria and is attributed to the following cause

1)Severe Exercise
2)High Protein Diet
3)Pregnancy (incase u r a female)
4)Fasting

Figure it out from these options but cheer up theres nothing to worry, it is sometimes a makeshift phenomenon due to disturbance in metabolism

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