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In: Biology
They are filled with some sort of pressurized fluid. When the weather changes, so does the air pressure, when it does, there is a different amount of pressure on the fluid, so it expands/contracts. This can be painful depending on the wound.
This also lets arthritic people feel weather in their bones.
If your scar itches or hurts when the weather changes, this is probably due to the damaged nerve fibres in the skin, which either run differently than usual due to the original injury or are affected by the scar’s connective tissue growing back. Even if your scar has not caused any discomfort for many months, a change in the weather can transmit stimuli to the body that trigger scar pain or itchy scars.
This is not a scientific, conclusive explanation, but the differently routed nerve fibres and the regrowing tissue are at least a partial explanation.
When barometric (atmospheric) pressure drops, it allows the soft tissue and fluid surrounding joints and old injuries (especially bone, joint, and connective tissue injuries) to expand. This expansion of tissue and fluids irritates nearby nerves, which send pain signals to the brain.
To expand on what others have said regarding scar tissue. It is important to note that although injuries can heal properly and essentially the original tissue fixes itself, there is another option which is that scar tissue can form which is basically the bodies emergency mechanism kicking in, scar tissue does the job so much as covering the body and not allow bleeding for example. However it isn’t exactly like whatever it is replacing, which is why scars don’t look like normal skin and don’t have hair. Scars tend to be less flexible/stretchy than skin, and that isn’t just on the surface but also below.
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