If you re experiencing minor pain it may be due to a muscle spasm or strain.
Floor slightly bending down.
A new floor design that satisfies code requirements for bearing capacity and rigidity resistance to bend may still be appreciably sloped after many years of service.
When there is weight going through the knee as you bend it such as when you squat down go up and down stairs and as you sit down in a chair non weight bearing.
Wet down the floor boards slightly.
The likelihood a given floor has for bending is affected by many factors but the most common primary cause is simply old age.
When sitting in a chair and moving the knee or standing but with the leg lifted off the floor as you bend it.
Wood responds to changes in temperature or humidity by warping and that can be bad news for your hardwood floor.
How to straighten a warped floor.
Set a cinder block or other large heavy weight on top of the bowed boards.
Warping manifests as gaps between the boards.
If your back hurts when you bend over you should assess the severity of the pain.
Dizziness when you bend over is a common occurrence.