Sharp pain on left side chest between ribs when lifting left arm + swollen painful lymph node under left armpit?

Some thoughts. A swollen painful lump in axilla (armpit) accompanied by pain on same side when lifting your arm is likely caused by an infection or inflammation of the sweat glands associated with hair follicles in axillary hair (hidradenitis suppurativa) or perhaps an irritation from deodorant. See Dr soon if you develop a fever or if the involved area doesn't improve or gets worse See:

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