Core theme: Naja is the duty-bound heart with a constricted throat. It speaks softly of guilt and responsibility, of suicidal thoughts that are held in check by conscience, as the larynx tightens and the heart labours. The physical axis is unmistakable: valvular/anginal pain that shoots to the left shoulder/arm; orthopnoea, blue lips, weak/irregular pulse; worse lying on the left side, worse after sleep, worse in warm rooms; better in open cool air, head raised, quiet, collar loosened, sometimes by firm hand-pressure over the heart [Hering], [Allen], [Clarke], [Kent]. The laryngeal partner is equally marked: aphonia, dry, teasing cough on attempting to speak, throat as if a cord—the heart-cough that ties chest and voice.

In serpent differentials, Naja lacks Lachesis’s hot, erotic loquacity and jealousy; it lacks Crotalus’s haemorrhagic violence; it lacks Elaps’s chill and black discharges. Instead it is sober, scrupulous, left-sided and laryngeal. Among angina remedies, compare Spigelia (stabs, neuralgia, ocular links), Latrodectus (panic-agony), Kalmia (rheumatic shot to arm with slow pulse), and Cactus (iron band without the moral–laryngeal stamp). The psycho-cardiac polarity (remorse restrained by duty) is the bedside clincher: when the patient whispers, “I deserve this,” loosens the collar, sits by an open window, presses the hand upon the heart, cannot lie on the left, and every word evokes a cough, Naja stands before others. The pace is subacute–chronic; reactivity is heat-worse, after-sleep-worse; sensitivities focus on neck pressure and speech. Treat gently: quiet, cool, upright, few words—nursing that mirrors the remedy cures.