Your pain could be due to muscle strain or spasm in left scapular region.
I would like to ask you few questions like How long do you have this pain? Was it a sudden or gradual onset? Do you have hypertension or
diabetes? Which activity aggrevates the pain? Was that a sharp pain? Radiating pain?
Next Steps
You should give hot water fomentation for 15-20 minutes twice a day.
You can use Volini gel or spray to the site provided you are not allergic.
You should avoid lying on the affected side.
You should not lift your baby with the left hand instead use your right with your left hand support.
You should do Rhomboid door way stretching and seated Rhomboid stretching for 20 seconds hold three repetitions thrice a day.
Health Tips
If the pain persists or aggrevates you need to consult a Physician or Physiotherapist or Orthopaedist for further evaluation and treatment in person or online.