 [ Symptoms ] i have a constant dull pain in my right upper chest about even with my armpit [ Disease ] it is most probably musculoskeletal pain of ribs and muscles in between them can be caused by strain severe cough or sneeze cold air current use hot packs on the area and avoid cold air strain of the muscles … just to be sure palpate your lymph nodes below armpit for any swelling if found hard and swelled compared to opposite side then you should get them investigated and examined by a doctor