That Pit in Your Stomach: Understanding the Anxiety-Gut Connection and What to Do About It

You know the feeling. That heavy, sinking sensation in your stomach that shows up uninvited; sometimes before a big presentation, sometimes for no obvious reason at all. It might feel like a knot, a void, a tightness, or like your stomach just dropped several floors. It’s visceral, uncomfortable, and often accompanied by the unmistakable sense that something is very wrong.

If you’ve experienced this “pit in your stomach” feeling during anxious moments, you’re not imagining it. Psychology Today reports that the enteric nervous system, the mesh-like network of neurons lining your digestive tract, causes the sensation of nervous butterflies or a pit in your stomach that are innate parts of our psychological stress responses.

This isn’t just a metaphor or “all in your head.” It’s a measurable physiological phenomenon rooted in the fascinating connection between your brain and your gut. Understanding what’s actually happening in your body when you feel that pit, and why, is the first step toward managing it.

Key Takeaways

Your gut is your “second brain” with 100 million neurons Psychology Today research shows the enteric nervous system contains more neurons than the spinal cord. Up to 90% of cells in stress responses carry information to the brain, making your gut as influential to mood as your head.

The pit is caused by blood flow redirection Science shows that during fight-or-flight response, blood is diverted from digestive tract to muscles and brain. This decrease in blood supply to your stomach creates the dropping, sinking sensation you feel.

The stress response unfolds in two phases Research identifies the quick response (adrenaline causes immediate changes) and slow response (cortisol maintains high alert). Both affect gut function, creating various uncomfortable sensations.

Morning anxiety intensifies the pit feeling Studies show the Cortisol Awakening Response increases cortisol 38-75% in the first 30-45 minutes after waking. This explains why many people experience that pit feeling most intensely in the morning.

Gut health directly affects anxiety levels Research indicates healthy, diverse gut microbes reduce likelihood of anxiety and depression. Gut-healthy foods can curb inflammation, lower cortisol, and reduce stress reactivity over time.

Deep breathing activates the “rest and digest” system Studies show slow, deep breathing with extended exhales activates the parasympathetic nervous system, directly counteracting fight-or-flight and restoring normal digestive function.

Chronic symptoms require professional evaluation UChicago Medicine research confirms stress is usually temporary, but chronic anxiety can lead to chronic GI symptoms. For people with IBS, stress triggers symptom flares requiring both medical and mental health treatment.

The Science Behind the Pit: Your Second Brain

Research has identified something remarkable about your digestive system: there’s an entire ecosystem of bacteria and a vast neural network operating in your gut, comprising some 100 million neurons; more than the spinal cord. This is not a thinking brain that reasons or solves problems, but mounting evidence suggests your gut’s health strongly influences your mood.

This system is called the enteric nervous system (ENS); your “second brain.”

According to UChicago Medicine gastroenterologists, research has shown there is a strong connection between our brain and our digestive tract through the central nervous system. The part of the central nervous system that serves the GI tract makes a direct connection between the brain and GI system.

Here’s what makes this connection so powerful: up to 90 percent of the cells involved in stress responses carry information to the brain rather than receiving messages from it. Your gut is as influential to your mood as your head is; perhaps more so.

What Actually Happens When You Feel That Pit

When you experience that sinking stomach feeling, you’re experiencing a cascade of physiological events triggered by your body’s threat detection system.

The Fight-or-Flight Response

The moment your brain perceives danger; real or imagined; it dispatches a message through the hypothalamus to the adrenal glands, initiating the fight-or-flight response. This unfolds in two phases:

Phase 1: The Quick Response Adrenaline floods your system, causing:

• Increased heart rate and blood pressure
• Constriction of blood vessels
• Strategic redirection of blood flow

As part of the fight-or-flight response, the body suppresses digestion and strategically reroutes its resources to other organs. The vital supply of blood to the digestive tract is diverted toward organs like the brain and muscles, which are recognized as essential for survival.

This redirection, the sudden decrease in blood supply to your digestive system, is what creates that dropping, pit-in-your-stomach sensation. Your stomach isn’t actually moving. It’s receiving dramatically less blood, and the nerve endings there are reporting this change to your brain as a distinctive, uncomfortable sensation.

Phase 2: The Slow Response If your body continues to sense danger, cortisol takes center stage. This stress hormone maintains the state of high alert and continues affecting digestive function.

What the ENS Does During Stress

Under normal circumstances, the neurons of the ENS, upon sensing food, signal the muscles in the digestive tract to contract and help digest the food. However, when you’re anxious or stressed, this entire system gets disrupted.

Research from UChicago Medicine explains that when we have anxiety and stress, hormones and neurotransmitters released in the body can negatively impact gut motility, the way our intestines and stomach squeeze and move waste through the body. Stress can also affect the delicate balance of bacteria in our gut, causing upset stomach.

Why Anxiety Targets Your Stomach

The gut-brain connection explains the mechanism, but why does anxiety so reliably manifest as stomach sensations? Several factors make your digestive system particularly vulnerable to emotional distress.

Your Stomach Is a Sensory Hub

The gastrointestinal tract is very sensitive to emotions such as anger, anxiety, sadness, and joy. The ENS contains millions of nerve endings that are exquisitely attuned to changes in your internal environment, including the hormonal and neurochemical shifts that accompany anxiety.

Individual Vulnerability

For some people, the stomach is the weak point through which anxiety manifests itself. If you’ve experienced stomach issues in the past (gastritis, IBS, or even just occasional digestive sensitivity), your nervous system may have “learned” to express anxiety through stomach symptoms.

The Gut Microbiome Connection

Research from Psychology Today indicates that those with healthy and diverse gut microbes are less likely to suffer from anxiety or depression. Many people who grew up in too-clean environments, frequently took antibiotics, and ate junk food have an unhealthy microbiome, which can make them more susceptible to anxiety-related stomach symptoms.

Common Anxiety-Related Stomach Symptoms

The “pit in your stomach” is just one of many ways anxiety can manifest in your digestive system. According to research, emotional symptoms affect the digestive system in various forms:

• The Pit or Sinking Feeling: Heavy, dropping sensation, often described as a void or hollow feeling
• Knots or Tightness: Sensation of stomach muscles clenching or tying together
• Nausea: Feeling like you might vomit, especially during acute anxiety
• Butterflies: Fluttering sensation, common before stressful events
• Sharp or Burning Pain: Can mimic heartburn or gastritis
• Changes in Appetite: Either complete loss of hunger or stress eating
• Digestive Changes: Diarrhea, constipation, bloating, or gas
• Sensation of Emptiness: Feeling hollow despite having eaten

UChicago Medicine notes that in stressful or anxiety-provoking situations, the brain-gut connection can cause normal physiologic processes to be interpreted as painful.

When Morning Anxiety Creates That Pit

Many people report that the pit-in-stomach feeling is particularly intense first thing in the morning. There’s a biological reason for this.

Research on morning anxiety shows that chronic morning anxiety can be linked to high levels of cortisol in the body upon waking. The Cortisol Awakening Response (CAR) is a marked increase in cortisol secretion over the first 30–45 minutes after rising in the morning.

During the CAR phase, an individual could see their cortisol levels increase anywhere between 38 to 75 percent, leading to intense feelings of worry, stress, or fear, and that characteristic stomach sensation that greets you before you’ve even gotten out of bed.

Do you wake up and automatically feel that pit in your stomach? Your mind is already racing, you feel uneasy and uncomfortable about the day ahead; this is the Cortisol Awakening Response interacting with pre-existing anxiety.

How to Calm an Anxious Stomach: Evidence-Based Strategies

Understanding the mechanism is helpful, but what can you actually do when that pit appears?

1. Practice Deep Breathing

Psychologists recommend deep breathing as it can help reduce anxiety by activating the body’s relaxation response. Take slow, deep breaths, inhaling through your nose and exhaling through your mouth. Concentrate on making your exhalation longer than your inhalation.

This directly counteracts the fight-or-flight response by activating your parasympathetic nervous system, the “rest and digest” system that calms your body and restores normal digestive function.

2. Use Mindfulness and Grounding Techniques

Research emphasizes mindfulness as another effective technique for reducing anxiety relatively quickly. When you feel that pit, try:

• 5-4-3-2-1 Grounding: Notice 5 things you see, 4 you can touch, 3 you hear, 2 you smell, 1 you taste
• Body Scan: Notice sensations throughout your body without judgment
• Present Moment Focus: Remind yourself that right now, in this moment, you’re safe

These techniques help shift your nervous system out of threat-detection mode.

3. Address Your Gut Health

Studies from Psychology Today show there is evidence that a healthy gut can curb inflammation and cortisol levels, lower your reaction to stress, improve memory, and even reduce neuroticism and social anxiety.

Incorporate gut-healthy foods:

• Yogurt with active cultures (Lactobacillus acidophilus, Bifidobacterium lactis)
• Fermented foods (sauerkraut, kimchi, kombucha)
• Prebiotic foods (garlic, onions, bananas)
• Dark chocolate (yes, really)

While research notes that simply taking a sip of kombucha won’t immediately calm anxiety, building a healthy microbiome over time can reduce your baseline vulnerability to anxiety-related stomach symptoms.

4. Eat Strategically

According to UChicago Medicine, it’s best to avoid spicy foods, fatty or fried foods, junk food, and anything with a lot of natural or artificial sugar. Plain foods like crackers, toast, rice, bananas, broth and water are good options until your stomach settles.

Medical News Today research also suggests peppermint can be soothing to the stomach and is available as a capsule or in teas.

5. Move Your Body

Research recommends being active and avoiding sitting for long periods of time as a way to reduce stress and anxiety. Physical activity helps metabolize stress hormones and signals to your body that the threat has passed.

Even a 10-minute walk can shift your physiological state and reduce that pit feeling.

6. Identify and Address Underlying Stressors

UChicago Medicine advises identifying your stress triggers and seeing if controlling the stress and anxiety in your life lessens your stomach discomfort.

This might involve:

• Journaling about what triggers the pit feeling
• Addressing specific stressors (relationships, work, health concerns)
• Setting boundaries to reduce overwhelming demands
• Working with a therapist to develop coping strategies

When It’s More Than Just Anxiety: Seeking Professional Support

Medical News Today emphasizes that a nervous stomach can mirror the symptoms of some GI disorders, including irritable bowel syndrome (IBS), Crohn’s disease, ulcerative colitis, and gastroenteritis.

UChicago Medicine recommends seeing your primary care physician if you often have stomach problems or GI discomfort. You should tell your doctor what’s going on so they can evaluate whether stress is actually what’s causing your upset stomach.

See a doctor if:

• Stomach symptoms persist for more than a few weeks
• Pain is severe or worsening
• You experience unexplained weight loss
• You have blood in stool or vomit
• Symptoms significantly interfere with daily life

Research confirms that normally, stress is temporary, so your GI issues will stop once the stress subsides. However, chronic anxiety can lead to chronic GI symptoms, and for people with irritable bowel syndrome (IBS), stress and anxiety can cause flares of symptoms.

The Role of Mental Health Treatment

Research from ADAA indicates that stomach problems are one of the most common symptoms of stress and anxiety, and addressing the underlying anxiety is often essential for lasting relief.

At Positive Reset Eatontown, our therapists specialize in evidence-based treatment for anxiety, including:

Cognitive Behavioral Therapy (CBT): Helps identify and change thought patterns that trigger anxiety and physical symptoms

Mindfulness-Based Approaches: Builds skills for managing physical sensations without amplifying them through worry

Somatic Therapy: Addresses the physical manifestations of anxiety directly

Exposure-Based Treatments: For anxiety that’s become conditioned to specific situations

The Bottom Line

That pit in your stomach during anxious moments isn’t “all in your head”; it’s a real, measurable physiological response involving complex interactions between your brain, nervous system, hormones, and gut.

As Psychology Today reports, the enteric nervous system causes these sensations as innate parts of our psychological stress responses. Your gut contains 100 million neurons and up to 90% of the communication flows from gut to brain, making this connection extraordinarily powerful.

Understanding what’s happening, blood flow diversion, stress hormone release, and ENS disruption can reduce the fear around the sensation itself. And knowing that you have tools to address it; through breathing, mindfulness, gut health, movement, and professional support, means you’re not helpless when that familiar pit appears.

The pit in your stomach is your body’s way of saying, “I’m perceiving a threat.” Sometimes that threat is real and requires action. Sometimes it’s your anxiety speaking. Learning to distinguish between the two, and having strategies for both, is what allows you to move through anxious moments without being controlled by them.

Frequently Asked Questions (FAQs)

Why do I get a pit in my stomach when I’m anxious?

Psychology Today research shows the enteric nervous system; 100 million neurons lining your digestive tract; causes this sensation as part of your stress response. During fight-or-flight, blood is diverted from your stomach to muscles and brain for survival. This decrease in blood supply creates the dropping, pit sensation you feel.

Is the pit in my stomach real or just psychological?

It’s completely real and measurable. Research from UChicago Medicine confirms the brain-gut connection is physiological; when anxious, hormones and neurotransmitters negatively impact gut motility and disrupt bacterial balance. The sensation is your enteric nervous system reporting these changes to your brain.

Why is the pit feeling worse in the morning?

Studies show the Cortisol Awakening Response (CAR) increases cortisol levels 38-75% in the first 30-45 minutes after waking. If you already have anxiety, this natural cortisol surge can trigger intense stomach sensations, racing thoughts, and unease before you’ve even gotten out of bed.

Can gut health improve my anxiety?

Research from Psychology Today indicates yes; those with healthy, diverse gut microbes are less likely to suffer from anxiety or depression. Studies show healthy gut bacteria can curb inflammation and cortisol, lower stress reactions, improve memory, and reduce neuroticism and social anxiety.

What should I eat when my stomach feels anxious?

UChicago Medicine recommends avoiding spicy, fatty, fried, and high-sugar foods. Plain foods like crackers, toast, rice, bananas, broth and water work best until your stomach settles. Medical News Today research suggests peppermint (capsules or tea) can be soothing. Long-term, incorporate gut-healthy foods like yogurt with active cultures.

How do I calm an anxious stomach quickly?

Research-backed strategies include: deep breathing with extended exhales (activates parasympathetic nervous system), 5-4-3-2-1 grounding technique (shifts focus from threat), gentle movement like walking (metabolizes stress hormones), and mindfulness (reduces fight-or-flight activation). These work by directly counteracting the physiological stress response.

When should I see a doctor about stomach anxiety?

UChicago Medicine recommends seeing your doctor if symptoms persist for more than a few weeks, pain is severe or worsening, you experience unexplained weight loss or blood in stool, or symptoms significantly interfere with daily life. Anxiety-related stomach symptoms can mirror IBS, Crohn’s, or other GI disorders requiring medical evaluation.