Radium bromatum gathers three dominant vectors into one portrait. First is the kinetic vector: a Rhus-like organism that stiffens on first movement and loosens with continued motion, that wants to walk in the air and even sweats into relief. Second is the cutaneous vector: a burning, itching skin that flares in warm rooms and in the warmth of bed, yet calms in open air; when mishandled it passes through dermatitis to ulcer, but paradoxically old naevi/corns and flaky nail edges may recede—evidence of a deep trophic influence [Clarke], [Boericke]. Third is the imponderable vector of sharp, electric pains, vivid dreams of fire, and a noon bowel periodicity with slate-coloured stools that “unlock” headaches and restlessness—odd, yet repeatedly observed [Clarke]. The patient’s language gives it away: “Nights are worst; my skin is on fire in bed; I have to get up, walk, breathe the air—then I’m easier. A hot bath helps the back, but the skin wants cool. My bowels go at noon and afterwards the head is clearer.” The circulatory and renal substratum—tension low, albumin/casts, chlorides ↑—mates the arthritic frame to a mild toxic load, explaining why joints and skin often sing together [Hughes], [Clarke]. Differentiate it from Rhus-t. (less burning skin/renal signature), X-ray (more fissures and light aggravation), and Ars. (burning > heat with a very anxious mind). When those three vectors converge—Rhus-type motion polarity, radio-skin burning < bed > air, and noon-stool/renal accents—Rad-br. becomes a cogent, grounded choice.