Many people, including myself, have experienced and wondered about that snap, crackle, crunch noise under the skin. It was usually considered "mysterious" and lead to fear. I wanted to solve the mystery for you. Here is what I believe is happening.
Crepitus: A clinical sign in medicine that is characterized by a peculiar crackling, crinkly, or grating feeling or sound under the skin, around the lungs, or in the joints. Crepitus in soft tissues is often due to gas, most often air, that has penetrated and infiltrated an area where it should not normally be (for example, in the soft tissues beneath the skin).
The term can also be used when describing the sounds produced by lung conditions such as interstitial lung disease—these are also referred to as "rales". Crepitus is often loud enough to be heard by the human ear, although a stethoscope may be needed to detect instances caused by respiratory diseases.
There you go. A mystery is solved and fear is lowered.
Strength and Love, peter
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