Feeling Sick After Pre Workout? 5 Reasons Why it Happens and How to Avoid it

Why Am I Feeling Sick After Pre-Workout?

Pre-workout supplements are designed to help give your body more energy, improve your focus, and make your overall workout performance better. Many people use them to feel more awake and ready before doing exercises, especially tough or long workouts. However, even though they can be helpful, these supplements can also cause problems for some people. 

This is especially true if they are not used the right way or if the body reacts in a certain way to the ingredients. Some of the ingredients that are commonly found in pre workout supplements can upset your stomach, make you feel dizzy, or give you a jittery or shaky feeling.

Let’s look at the most common side effects and what causes them.

Common Ingredients That Might Make You Feel Sick

Many multi-ingredient pre-workout supplements contain powerful stimulants and performance boosters. While they can help you crush a workout, they might also make your body react in uncomfortable ways. Some common ingredients include:

• Caffeine – Great for energy but can upset your stomach, raise your heart rate, and cause jitters.
• Beta-alanine – Known for the "tingly" feeling in your skin, it’s safe but can feel weird.
• Creatine – Helps build muscle but may cause water retention and bloating in some people.
• Nitric oxide boosters – These help increase blood flow, but too much can drop your blood pressure, leading to dizziness.
• Amino acids – Good for muscle recovery but may upset your stomach in large amounts.

If you’ve taken a pre-workout and felt weird, one of these ingredients is likely affecting you. Everyone's body reacts differently, especially when high doses are involved.

Taking Pre-Workout on an Empty Stomach

Another big reason you may feel sick is taking pre-workout on an empty stomach. This is a common mistake. Without food, the strong ingredients hit your system all at once. This can:

• Cause nausea or stomach cramps: Some pre-workout ingredients can upset your stomach, especially if taken on an empty stomach or in high amounts, leading to nausea or cramping.
• Make you feel light-headed or dizzy: Pre-workouts can raise your heart rate or affect your blood pressure, which might make you feel dizzy or unsteady during exercise.
• Leads to a sudden energy crash mid-workout: While pre-workouts give a quick energy boost, the effect can wear off fast, causing you to feel tired or sluggish halfway through your workout.

To avoid this, try eating a small snack like a banana or toast before your supplement. It helps your body handle the pre-workout better.

Side Effects of Pre-Workout Supplements to Watch For

Here are some signs your pre-workout isn’t sitting well with you:

• Upset stomach: Some ingredients in pre-workout, like caffeine or creatine, can irritate your stomach and cause nausea or cramping.
• Headache: Pre-workouts may raise your blood pressure or contain stimulants that lead to headaches, especially if you're sensitive to them.
• Fast or irregular heartbeat: High doses of stimulants can cause your heart to beat too fast or feel like it's skipping beats, which can feel scary.
• Dizziness or fainting: Taking pre-workout on an empty stomach or during intense exercise can drop your blood pressure, making you feel lightheaded.
• Skin tingling or itching: Beta-alanine, a common ingredient, can cause a harmless tingling or itchy feeling on your skin, especially in high doses.
• Feeling anxious or “on edge”: Too much caffeine or other stimulants can overstimulate your nervous system and make you feel nervous, anxious, or jumpy.

These side effects of pre-workout supplements usually happen when the dose is too high or your body isn’t used to it yet.

If these signs happen often, it might be time to switch to a different product or skip the pre-workout altogether.

How to Stop Feeling Sick After Pre-Workout

Good news! You can avoid that sick feeling with a few easy changes:

1. Start with a Small Dose

Begin with half the recommended dose. Let your body get used to it before increasing.

2. Eat Something Light First

Even a small snack can help. Try oatmeal, fruit, or a slice of toast about 30 minutes before.

3. Drink Water

Many pre-workouts are dehydrating. Stay hydrated before, during, and after your workout.

4. Pick Simpler Supplements

Avoid multi-ingredient pre-workout supplements with too many stimulants. Choose one with fewer ingredients to reduce the chances of sickness.

5. Track Your Reactions

Use a fitness app like MyFitnessCoach to log your supplement intake and symptoms. You might notice a pattern or find the right time and dose for you.

What Science Says About Pre Workouts

The International Society of Sports Nutrition says that pre-workout supplements can be useful if they are taken the right way. They can help boost your energy and performance during exercise. However, they also explain that not everyone reacts to them the same way. What works well for one person might cause problems for another.

If you take pre-workouts too often or in large amounts, they can affect your nervous system and your heart. This could lead to side effects like a fast heartbeat, shakiness, or even feeling very anxious. That’s why it’s important to be careful.

Always take time to read the label on your supplement bottle. Look at what ingredients are in it and how much of each one is included. Don’t mix your pre-workout with other things that give you energy, like coffee or energy drinks, because this can make the side effects stronger and more dangerous.

How MyFitnessCoach Can Help

If you're trying to build a routine that works without the unpleasant side effects, the MyFitnessCoach app is here for you.

With our all-in-one fitness app, you get:

• Customized workout plans for every goal
• Prehab and rehab workouts to avoid injury
• Food and workout logging to track how pre-workout affects you
• Guided sessions in yoga, Pilates, and meditation
• Integration with wearables to track heart rate and performance
• “Build your own workout” tools to create plans that work best for your body

Whether you’re doing high-intensity exercise or just starting out, MyFitnessCoach helps you stay safe, fit, and feeling your best.

Are There Free Pre Workout Alternatives?

Yes! You don’t always need to buy a supplement. Some free pre-workout options that naturally boost energy include:

• A cup of black coffee: Drinking a small cup of black coffee can give you a natural energy boost without all the extra ingredients found in pre workout supplements. It also helps improve focus and alertness before your workout.
• A light snack with protein and carbs: Eating a small snack like a banana with peanut butter or yogurt with fruit gives your body the fuel it needs, helping you stay strong and energized during your workout.
• A short walk or warm-up session: Doing a quick warm-up or taking a short walk gets your blood flowing, wakes up your muscles, and helps your body get ready for exercise in a safe way.
• Listening to upbeat music to get in the zone: Playing your favorite fast-paced songs can boost your mood, increase motivation, and help you mentally prepare for a great workout.

Sometimes, just a healthy routine is better than any powder.

Final Thoughts

Feeling sick after pre-workout can be frustrating, but it’s also avoidable. Start small, eat before your dose, and stay hydrated. Pay attention to how your body reacts, and don’t be afraid to skip the pre-workout if it doesn’t suit you.

And remember, you don’t have to do this alone. With MyFitnessCoach, you can create a workout plan that fits your body, your energy, and your goals. From personalized routines to wellness tools, this app has everything you need to feel great and stay fit.

Download MyFitnessCoach now and say goodbye to sick feelings and hello to stronger workouts.