Why am I experiencing right armpit pain without a lump?

There are several reasons you might feel pain in your right armpit even if you do not feel any lump. One possibility is nerve irritation. Some research shows that pain in the armpit may happen when nerves in the upper chest are squeezed or affected. This pain happens even without a visible lump because it is coming from the nerve and not a mass. Another reason can be axillary web syndrome. This is when small bands or cords of tissue form under the skin and cause pain, even if you can't see or feel a lump. Rarely, pain might be an early sign of other conditions like cancer. In those cases, pain might come before any masses are felt. Each of these reasons causes discomfort in different ways. If you keep feeling this pain or if it gets worse, you can check your symptoms with our free AI-powered tool and then talk with a healthcare provider who can help find out exactly why and decide on the best treatment plan for you.