A smelly sink drain is generally not a direct health risk, but it can indicate underlying hygiene or plumbing issues that require attention. The foul odor is typically caused by organic food sludge, bacterial slime, or mold growing inside the garbage disposal or on the inner walls of your drain pipes. However, if the smell is caused by a dried-out plumbing P-trap allowing raw sewer gases (which contain hydrogen sulfide and methane) to enter your living space, prolonged exposure to heavy sewer gas can cause headaches or nausea. Verification: Clean the disposal with baking soda and vinegar and pour water down all drain P-traps to restore their liquid seals.
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