Ever experienced lock jaw?

How often have do you experience it?

What do you do to help it?

Did you go to the doctor?

How was it in the beginning, like the signs?

Is this serious or a common thing?

Yesterday before be out of nowhere my mouth became difficult to open. I was able to still fit two knuckles in but no more. Then I tried to open again and I heard a pop, like knuckles popping but in my jaw, I kept opening my mouth( not wide) but just a little and it kept popping maybe five more time and then stopped. This is weird, I’ve never experienced this before.