The list of medical condition causes of Bitter tastes (Bitter taste in mouth) includes:
* Acid reflux / heartburn - acid taste in mouth
* Acute mercury inhalation - metallic taste in mouth
* Anchovy poisoning (clupeotoxin) - metallic taste
* Bonefish poisoning (clupeotoxin) - metallic taste
* Chemical poisoning -- Cadmium - metallic taste in mouth