Lower back pain when climbing

Suffered pretty badly with this on Wednesday. Any possible causes?
I probably did more climbing than normal, never had issues on this bike before though.
A possible thought is that since going 1x10 I'm putting more power in to climbing, instead of spinning up the climbs. Is this likely to cause the pain.
Is it just a case of MTFU for now?
I probably did more climbing than normal, never had issues on this bike before though.
A possible thought is that since going 1x10 I'm putting more power in to climbing, instead of spinning up the climbs. Is this likely to cause the pain.
Is it just a case of MTFU for now?
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I might have to put it down to not being used to that amount of climbing, just looking for any common causes to try rectify it so it doesn't happen again.