### **1. A Nail or Screw Popping Through**
One of the most common culprits is a **nail or screw** that has slowly worked its way down.
This can happen due to:
* House settling
* Temperature changes
* Vibration from footsteps above
* Aging construction materials
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Over time, gravity and movement can cause fasteners from flooring or framing above to push downward until they finally break through the drywall.
