Why Is Coffee Making Me Nauseous All of a Sudden?

Have you ever started drinking coffee and suddenly felt like you were about to throw up? You may ask yourself, why is coffee making me nauseous all of a sudden? I’ll explore why java might be making you feel ill and tips on remedying the situation.

Why Is Coffee Making Me Nauseous All of a Sudden?

Coffee could suddenly make you nauseous because caffeine is a very powerful diuretic that causes you to lose water from your body. It affects your hydration levels by drawing water from the bloodstream, which leaves you feeling nauseated. 

Woman experiencing a nasty headache

There are several reasons that java might suddenly make you feel nauseous; let’s look at them.

Being Sensitive to Caffeine

Another possibility is that you’ve developed a sensitivity to caffeine. This happens when the body becomes used to having caffeine and starts to produce less of its natural stimulants (adenosine). When adenosine levels drop too low, symptoms like headaches and nausea.

If you’re sensitive, it’s best to avoid java or limit your intake to a small mug. You can also try decaffeinated java, they might taste slightly different but they’re a great alternative.

Using Milk as an Additive 

If you usually drink your cup of joe with milk and sugar, you might be surprised to find that these ingredients can also cause nausea. Milk can cause nausea because it’s a dairy product, and it is high in fat and can be difficult to digest.

Sugar can also cause nausea because it’s a simple carbohydrate quickly absorbed into the bloodstream. It can cause a sudden spike in blood sugar levels. 

If you’re feeling nauseous after using milk in your cup of joe, try taking it black with a non-dairy alternative such as soy or almond milk. You can also try sugar alternatives such as adding a natural sweetener, such as honey.

Drinking Coffee on an Empty Stomach  

Drinking java first thing in the morning can also cause nausea. This is because your stomach is empty, and it can irritate it. It’s best to wait a few hours after waking up before having your morning cup of joe. 

Man nauseous after drinking his coffee

Lacking Enough Water in the Body 

Since caffeine is a diuretic, it causes frequent urination, which can lead to dehydration. If you’re already dehydrated, even a small amount can make you feel nauseous.

It’s essential to stay hydrated when drinking coffee, especially if you’re sensitive to caffeine. You can do this by drinking a glass of water for every cup of joe you consume.

Reacting to Acidity Levels

Coffee beans are naturally acidic. The acids can cause heartburn or worsen existing stomach conditions, such as ulcers. If you’re susceptible to heartburn or other gastrointestinal issues due to caffeine, you might want to avoid it altogether.

If an ulcer is present, the acids can irritate it and cause pain. In the case of Crohn’s disease or another inflammatory bowel disorder, java can worsen your symptoms. It can also stimulate the production of stomach acid, which can lead to nausea.

Cold brewing is a great way to reduce your drink’s acidic level, and it tastes better too. Avoid blonde espresso as it will be highly acidic, but you can use darker roast beans since they have a lower acid. Eating a banana can help since it’s alkaline, and it will help reduce acidity.

Being Pregnant

Caffeine is a stimulant and can cause nausea, vomiting, and diarrhea. It’s best to avoid it during pregnancy. Limiting your intake to 200 mg per day if drinking java is necessary. It can also cross the placenta and affect your baby. 

Husband taking care of his sick wife after drinking her cup of coffee

Overdosing on Caffeine 

Too much caffeine can make you feel jittery, anxious, and nauseous. If you’re not used to drinking coffee, even a small cup can make you feel like passing out. You can try other alternatives to java, like tea or smoothies, if you don’t know the amount of java you should consume.

Related Questions

Can You Suddenly Become Sensitive to Coffee?

Yes, this is due to either your body developing a tolerance over time or simply being allergic to it. Caffeine’s effects are highly individual and can be affected by many factors, such as the ability of your liver to metabolize caffeine and genetics. 

How Do You Fix Coffee Nausea?

Nausea can be remedied by drinking lots of water. It’ll help let those toxins move out through sweat while providing hydration all at once, making everything feel better fast. 

Why Does Coffee Make Me Nauseous and Shaky?

Caffeine is a stimulant that temporarily blocks your brain’s ability to produce serotonin, leading you into an anxious state of mind. When you go through your day on an empty stomach, it can reduce the amount of serotonin produced by the brain, which could make you feel jittery and weak.


By knowing what is causing your aversion to caffeine, you don’t have to wonder why coffee is making me nauseous all of a sudden. You may be dehydrated, your java is too acidic for your taste, you’ve become more sensitive, you’re pregnant, or you’ve had too much caffeine.