What Could Cause Pain under My Right Armpit That Radiates Towards the Back?

There are a few possible reasons you might feel pain under your right armpit that travels toward your back. One possibility is scapulothoracic bursitis. This is when the small fluid-filled sacs (bursae) near the shoulder blade become swollen and hurt. It can create discomfort that spreads from the armpit toward the back. Another cause might be related to nerve injuries. Sometimes, surgery involving the neck or spine can affect nerves, which can send pain signals along their path to your back. Additionally, if you have had surgery in the armpit area, such as an axillary lymph node dissection, the nerves in that area might be affected. This can lead to pain that starts in the armpit and radiates backward. Each of these conditions affects your tissues and nerves in different ways. If your pain keeps coming or begins to interfere with your daily activities, it is important to discuss it with your healthcare provider so they can help find the best way to make you feel better.