I AM HAVING a pain on the right side of my back. The pain is not severe but more of a nagging. sometimes it goes under my right arm. like in the lymph nodes.  My family has a history of cancer. I DONT FEEL a knot, just a nagging pain. I thought it may have been from exercising, but its been about two weeks and hasnt gone away.
Hello, Since you have a family history of cancer & now you have discomfort under right arm(maxilla), you are suggested to have a physical examination done at the earliest to rule out Axillary lymphadenopathy or a Malignant lymph node neoplasm. Your treating doctor may ask you to go through a series of blood workouts & Imaging tests or Biopsy if needed. Other reasons for back pain can be a muscle strain, improper posture, pinched nerve, spinal stenosis, degenerative disc disease, fibromyalgia. For relief from pain you can take analgesics or NSAIDs, one so when needed. Your treatment will depend upon the pathology detected. Hope I have answered your query. Let me know if I can assist you further. Take care Chat Doctor.