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2. Muscle Strain or Injury

Muscle strain can also cause armpit pain. Muscle strain can be minor from overuse or significant when the muscle is partially or completely torn. Although muscle strain or injury is more common in the back and lower limbs, it does happen to the muscles in and around the shoulder, as in a rotator cuff injury, leading to pain in the armpit.

young woman in gym with sore arm

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This site offers information designed for educational purposes only. You should not rely on any information on this site as a substitute for professional medical advice, diagnosis, treatment, or as a substitute for, professional counseling care, advice, diagnosis, or treatment. If you have any concerns or questions about your health, you should always consult with a physician or other healthcare professional.