See a physician: This could be a large number of things, some serious, such as an upper extremity blood clot and even a heart attack can cause some these issues. Be safe and get checked out. Also make sure you have regular breast exams as breast cancer that has reached the lymph system on the left side can cause this. After you clear these possibilities, look at thoracic outlet and muscular issues.
Answered 2/5/2020
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