What Causes Unusual Pain On Left Foot?

For the past two days I have noticed a pain on the top of my left foot. I haven t been exercising and haven t hurt myself at all. I do some lifting at work. The pain is on the top part of my foot and felt more when walking or bending my foot. I also had the toe next to my big toe cramp and bend tonight and I was unable to move it for about a minute. The pain on top of my foot is not getting worse, it s just bothersome. It is not swollen, red or bruised. My foot looks normal.