Sour taste in the mouth is due to:

Question

BlackTom AI · Accepted Answer

Sour taste in the mouth is classically a manifestation of Liver–Stomach disharmony in Traditional Chinese Medicine (TCM), so B is correct.

1) Relevant knowledge points and concepts
- Five tastes map to zangfu: sour → Liver, bitter → Heart, sweet → Spleen, pungent → Lung, salty → Kidney.
- Pathomechanism: Liver qi stagnation or rebellious Liver qi can invade the Stomach (Liver overacting on Stomach), causing upward counterflow of stomach qi and sour regurgitation/acid perception.
- Typical accompanying signs: hypochondriac distension, belching, acid regurgitation, nausea, irritability.

2) Step-by-step reasoning
- Patient reports a sour taste specifically (not bitter, sweet, bland or salty). According to taste-organ associations, sour implicates the Liver system.
- When the Liver’s qi is constrained, it tends to rise or invade the Stomach, disrupting normal descending function of Stomach qi. That disruption produces acid or sour regurgitation and a persistent sour taste.
- Therefore the most appropriate single-pattern diagnosis is Liver–Stomach disharmony (Liver invading Stomach or Liver qi rebelling).

3) Calculations / intermediate steps
- No numerical calculations apply. Logical inference: sour taste → Liver involvement; concurrent symptom pattern → Liver-stomach disharmony.

4) Why the correct answer is correct
- The causative link (Liver qi affecting Stomach) explains sour flavor physiologically within TCM and matches clinical presentations of sour regurgitation, belching, and hypochondriac distension.

5) Why other options are incorrect
- A (Dry-heat damaging fluids): causes dry mouth, thirst, bitter taste, or less fluid, not a sour taste.
- C (Spleen–stomach damp-heat): produces sticky sweet or bitter taste, heavy sensation, bad breath, and greasy tongue coating—more damp/heat signs than sour.
- D (Spleen–stomach qi deficiency): yields bland taste, poor appetite, loose stools, fatigue—deficiency symptoms rather than sour regurgitation.

6) Conclusion
- Based on taste-organ associations and the pathomechanism of Liver qi invading the Stomach, the correct answer is B. This matches the provided answer.

Sour taste in the mouth is due to:Single choice

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