Hi I have a lump in my left arm pit about 1inch by 1/2 inch that I get discomfort from and also suffer severe night sweats and sleep paralysis. I also found a lump where my rib cage meets which was said to be costochondritis. I suffer back pain allot these days but put it down to my job. I m 28 years old and a little worried it may be lymphoma. Iv had chest scans, blood tests etc and am awaiting a ultra sound for my arm pit.