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This could mean irritation of nerve
- 5-th Lumbar root.
Some times local pain is not felt - only the referred pain
The most distal part is the first one to feel.
The best option will be to see a Neurologist
- you need physical examination / possibly MRI
of the Lumbo-sacral spine.
A nerve compression must be excluded before you proceed with the gym activity
Until then Rest is important during the acute stage - to heal and to avoid further injury
, if there is one.
Wishing speedy recovery