More than likely a small blockage. pour boiling hot water down the drain and add some bi carb and vinegar to it.
see that vent is downstream from trap
The odd smell coming from the kitchen is likely due to something burning or spoiled food.
The unpleasant smell under the kitchen sink could be caused by a variety of issues such as a clogged drain, rotting food, mold growth, or a leak in the plumbing. It is important to investigate and address the source of the smell to prevent further issues.
The unpleasant smell coming from your shower drain could be caused by a buildup of bacteria, mold, or debris in the drain. This can lead to a foul odor being emitted from the drain. Regular cleaning and maintenance of the drain can help eliminate the smell.
Lime
check your furnace or kitchen.
The smell of rotten eggs in your kitchen drain is likely due to a buildup of organic matter, such as food particles or grease, that has decomposed and produced hydrogen sulfide gas. This gas has a distinct rotten egg odor. Regular cleaning and maintenance of your drain can help prevent this unpleasant smell.
Depends on the smell. What does it smell like?
The smell of rotten eggs coming from your kitchen sink drain is likely due to a buildup of organic matter, such as food particles or grease, that has decomposed and produced hydrogen sulfide gas. This gas has a distinct rotten egg odor. Regularly cleaning your sink and using a mixture of baking soda and vinegar or a commercial drain cleaner can help eliminate the odor. If the smell persists, it may indicate a more serious issue with your plumbing that requires professional attention.
A dishwasher can cause a bad smell at the kitchen sink. most of the time it is either the disposal it self, or drain tube is full of food by material, between disposal and baffle tee, or if have or had leaks could be coming from under cabinet, mold and bactieria growing
The unpleasant smell coming from your bathroom sink could be caused by a buildup of bacteria, mold, or debris in the drain or pipes. It is recommended to clean the drain and pipes thoroughly to eliminate the odor.
old dust or cat piss.