Toe problem?

One of my big toes has started aching, and when I bend it it often makes a loud snapping noise- very similar to somebody clicking their fingers. 
It's not been injured in any way I can think of, so is this more likely to mean there's some small problem with the toe's joint? It's not causing me any problems, I'm just curious, especially as my other toes neither ache nor snap. 

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