When you are dehydrated, your body conserves water by making mucus thicker. When you chug hot tea (bonus points for ginger and lemon), you signal your body to loosen up.
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But here is the chemistry: The mucus in your nose is sticky by design. It traps viruses and pollen. When you’re congested, that mucus becomes thick glue. A saline rinse doesn't just "wash" it out; it thins the viscosity. decongestants natural