What could cause tingly left side right under my armpit. It comes and go at least 5 times a day?

* A pinched nerve in your neck or upper back

* Muscle strain in your chest or shoulder

* A herniated disc in your neck or upper back

* A blood clot in your arm

* A heart attack

* A stroke

* Anxiety

* Diabetes

* Thyroid problems

* Vitamin B12 deficiency