• Vestibular apparatus / sensorium: Vertigo and nausea from the least noise or vibration, closing eyes aggravates, classic seasickness profile; downward motion and swaying intolerable. Cross-ref. Head, Respiration, Generalities. [Hering], [Allen], [Clarke], [Boger]
• Auditory hyperacusis: Every noise penetrates the teeth, causes nausea, shivering, or faintness; music unbearable. Cross-ref. Ears, Teeth, Mind. [Hering], [Kent], [Farrington]
• Spine (cervico-dorsal): Spinal irritation, soreness along cervical and upper dorsal segments; headaches begin in the neck and ascend; jar and pressure felt along the spine. Cross-ref. Back, Head. [Boger], [Clarke], [Allen]
• Stomach (neuro-vegetative): Motion-sick nausea, retching from noise or closing eyes; gastric faintness with cold sweat. Cross-ref. Stomach, Generalities. [Clarke], [Boericke]
• Teeth/jaws: Toothache from sounds, vibration, and drafts hitting ears; cannot bear brushing when the room is noisy. Cross-ref. Teeth, Ears, Head. [Hering], [Allen]
• Head (cephalalgia): Headaches provoked by noise, music, reading aloud, riding, sea travel; often better while eating (not constant). Cross-ref. Head, Food/Drink. [Clarke], [Tyler]
• Psychic reactivity: Irritability, timidity, startle from trifles; mental over-excitation from sensory input with post-exhaustion. Cross-ref. Mind, Sleep. [Kent], [Farrington]
• Eyes (visual–vestibular link): Closing eyes precipitates vertigo and nausea; visual motion (reading in carriage) intolerable. Cross-ref. Eyes, Head, Generalities. [Allen], [Boger]
• Respiratory/diaphragmatic synchrony: Sighing, short breath with nausea; downward motion or noise seems to “stop breath” momentarily. Cross-ref. Respiration, Generalities. [Clarke], [Boericke]

• Absolute quiet; sound insulation; gentle, steady environment. [Hering], [Kent]
• Eyes open, fixed gaze on the horizon during travel; cool fresh air gently moving. [Clarke], [Boger]
• Eating a little during headaches or travel in some cases; slow, small sips (not cold shocks). [Clarke], [Tyler]
• Lying with head and neck supported; reclining without jarring. [Boger], [Allen]
• Firm, even pressure along paravertebral muscles (between attacks). [Clinical], [Boger]
• Rhythmic breathing and minimal head motion. [Clinical]
• Darkened, quiet room for cephalalgia—provided no sudden noises intrude. [Clarke]
• After sleep when sleep has been truly quiet and uninterrupted. [Allen]

• Noise of any kind—whisper, rustle, crockery, music; sounds seem to pierce the teeth and stomach. [Hering], [Kent], [Farrington]
• Closing the eyes, even at rest; seasickness distinctly worse eyes shut. [Allen], [Clarke], [Boericke]
• Vibration and motion—carriage, ship, rail, descending stairs, downward motion. [Boger], [Clarke]
• Reading in motion; visual oscillations (waves, trees passing). [Allen]
• Jar, sudden touch to the spine or head; drafts at the ear. [Boger], [Hering]
• Talking or being talked to during an attack; mental exertion with sensory input. [Kent], [Clarke]
• Warm, close rooms, especially noisy gatherings; stuffy theatres with orchestra. [Clarke], [Tyler]
• After slightest stimulant (coffee, alcohol) in sensitive subjects. [Hughes], [Clarke]

The Ther. patient is over-tuned: the world’s smallest sound or vibration detonates a disproportionate nervous reaction, ending in nausea, shivering, or faintness [Hering], [Kent]. There is irritability from the continual effort to ward off stimuli; a whispered conversation, distant music, or the clink of a cup may be implored to stop. Fear is practical—fear of noise and motion—rather than abstract; the subject arranges life around quiet and stillness, avoiding carriages and ships unless a strict plan (eyes open, horizon fixed, silence) is followed [Clarke], cross-linking to Better quiet, Better eyes open. Between bouts, the patient may appear timid, hurried, and exhausted, with sensory dread colouring attention; small duties are abandoned because thinking while noises occur precipitates a wave of sickness. Compare Cocculus, whose prostration and dizziness spring from loss of sleep and motion with more general weakness; Ther. is noise- and eye-closure-driven with spinal soreness. Tabacum has deadly cold sweat and seeks open air, relieved by uncovering the abdomen; Ther. shrinks from sound chiefly and worsens eyes shut [Clarke], [Boger], [Boericke]. A brief bedside line: a violinist unable to endure rehearsal—notes shoot through teeth, stomach turns, and closing eyes while playing worsens vertigo—recovered on Ther. with strict rehearsal pacing [Tyler]. [Clinical]

Headaches often begin in the cervical spine, climb over the occiput to vertex and forehead, and are excited by noise and motion [Allen], [Boger]. The scalp feels as if vibrated from within; consonants, metallic sounds, or rhythm set up hammering pains. Closing eyes to rest paradoxically increases vertigo and sickness, a hallmark tie to the vestibular axis [Clarke]. Some patients note amelioration while eating, with aggravation returning when eating ceases, a feature observed by several clinicians [Clarke], [Tyler]. The least jar—descending a step, a door-slam—reverberates along the occiput and neck. Differentially, Theridion diverges from China (hyperacusis with throbbing worse pressure) by its noise → stomach/vertigo link and from Gelsemium (dull heaviness, diplopia, motor laxity) by spinal soreness with sensory piercing.