What is that clicking I hear within my herald when I way of walking sometimes? Will choose Best Answer?

It hasn't happened for months and happened today. I hear a clicking in my guide with each steps. I live healthy (no smoking, no drinking, no drugs). What is this annoying clicking, sometimes I have a feeling it too. It happens very rarely. I run if it help your answers.
Answers:    I wish these people would've answered.

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