Why do my arms click a lot?

The last few weeks I've noticed that when I reach high, or extend my arms out or doing arm exercises my arms in the bicep area click or sound like a snap.

It doesn't hurt, it just feels uncomfortable.

I've never had this happen before & just noticed it recently.

I haven't been lifting weights or heavy things.

When I started back doing weightless arm exercises in the last few weeks that's when it started to happen.

Why do my arms click a lot?
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