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The Role of Capsaicin: Chili peppers contain an active compound called capsaicin, which is the primary driver behind the "heat" sensation and the subsequent physical reactions.
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Receptor Binding: Capsaicin binds to specific nerve receptors in the mouth and nose that are naturally designed to detect and respond to physical heat.
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The "False Alarm" Signal: Even if the food is cold, capsaicin triggers these receptors, causing the nerves to send a signal to the brain as if the body is being exposed to actual burning heat.
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Neurogenic Inflammation: In response to this perceived heat, the nasal lining initiates a protective mechanism known as neurogenic inflammation.
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Physiological Response: During this process, nerves release signaling molecules that relax blood vessels and increase blood flow to the area.
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Mucus Production: This increased activity stimulates glands in the nose to produce watery mucus. The biological purpose of this mucus is to act as a solvent to wash away the irritating substance.
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Ineffectiveness of Water: Because capsaicin is oily and does not dissolve in water, drinking water is largely ineffective at stopping the reaction or the runny nose.
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The Casein Solution: Milk is a more effective remedy because it contains casein, a protein that binds to oily capsaicin molecules and helps flush them away.
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The Sugar Effect: Sugar also provides relief by interacting with capsaicin and reducing its ability to cling to nerve receptors, effectively "crowding out" the irritant.