Hi Perepere,
It makes sense that your symptoms are different, since your bad disc is higher up. For me, L3/L4 was fine, so standing was possible to some extent. Sitting was impossible for me. The lower discs make sitting difficult. Since your L4/L5 and L5/S1 are ok, that very well can explain how sitting is not a problem for you.
The bending thing makes complete sense too. For me, in the beginning, when I could sit a little bit, there was a big difference in what type of chair I sat in. The key idea was: in various sitting positions, your tailbone and sacrum bends slightly different, which affects pain.
Likewise, for you, bending while standing affects the positioning of your L3/L4 disc which makes your bulge/tears touch more or less on the nerves.
Having only L3/L4 bad is indeed more rare. Is there possibly some special sport or work you do that could have contributed to this?
Pain in static position is common for DDD regardless of disc. I would bet that some form of traction or hanging can temporarily give you pain relief, am I correct?
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2015 Lost ability to sit
2016 Gradually worsening despite conservative treatment
2016 L4-L5, L5-S1 activ L success!
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