The pain in the armpit when the mood is agitated may be due to axillary paraganglionic hyperplasia, breast tumor, angina, and so on. 1. Axillary paraganglionic hyperplasia: axillary paraganglionic hyperplasia is related to the endocrine function of the patient, axillary paraganglionic hyperplasia oppresses the surrounding normal tissues, which will lead to axillary pain when the patient is agitated. 2. Breast tumor: breast tumor may be caused by endocrine disorders, heredity and bad dietary habits, breast tumor or because of emotional changes lead to blood vessel expansion and thus compression of peripheral nerves, which leads to the phenomenon of pain, so when the patient is in an agitated mood, there will be underarm pain. 3. Angina: agitation can cause elevated blood pressure, coronary artery contraction, resulting in a decrease in blood supply to the heart, myocardial ischemia occurs, can appear left chest underarm pain. The heart of the left chest and armpit pain suggests that the patient timely medical care, clear cause of the left chest and armpit pain of the specific causes and targeted treatment.