
Pain In Arm Pit Occurs While Stretching, Lifting. Reason For This ?

Thanks for posting your query.
From your symptoms it looks like damage or probably rupture of the muscle tendons in the area which has caused tendonitis. The other possibility is of throcaic outlet syndrome which is caused by compression of both the blood vessels and the nerves.
You need to get a MRI scan of the area and a physical examination.
I suggest you to apply cold compresses in the armpit and take some Ibuprofen after prescription from your doctor.
Give complete rest to the part and avoid doing any activity like raising your arms or stretching the arms which causes any further damage. Also avoid sleeping with the arm extended up behind the head.
Depending on the MRI findings, tendon repair and thoracic outlet syndrome may need a surgical repair but this is reserved for severe cases. So get a MRI done.
Hope this answers your query. If you have additional questions or follow up queries then please do not hesitate in writing to us. I will be happy to answer your queries.
Wishing you good health.

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