one who shares someone's troubles or pain, etc.

share the trouble or sorrow (of another), to sympathize

agony and pain, pain, trouble, disaster

pain of affliction, suffering, distress, grief

Sciatica.

increasing pain, ache, anguish, ardour

give or cause pain

pain enhancer

sympathetic, compassionate

painful, distressing, pathetic, agonising

miracle of pain

honoring pain

acquainted with pain, sympathizer

painful, full of sorrow, sad

couplets of pain, agony