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It is rather difficult to conclude.
rules out many major pathological problems.
This could be a tear of a few muscle or ligament fibres at that time.
Posture at work or bed may not be appropriate for it to rest and heal.
Rest to the part for a few days, followed by gradual return to normalcy over the next few days may help. Warm compress may be useful. A Rheumatologist
may do further tests and arrive at possible diagnosis and solution. A Physiotherapist can suggest postural adjustments and relaxation techniques
Wishing speedy recovery