Why Your Stomach Drops: What Happens in Your Body During Stress and Anxiety

Stress can show up in your body before you have time to make sense of what’s happening. 

Have you ever felt your heart race after an unexpected phone call? Or noticed your stomach drop when you received news you weren’t expecting? Maybe your hands got sweaty, your chest felt tight or your thoughts started moving faster than usual. 

These physical reactions can feel alarming, but they’re often part of the body’s natural stress response. “When your brain senses a possible threat, whether it is physical danger, emotional stress or a sudden worry about someone you love, it sends signals through your nervous system to help you respond quickly,” said Joseph A. O’Brien, MBE, MSW, LCSW, Manager of Outpatient Behavioral Health Services at Inspira Health. “Stress and anxiety cause symptoms throughout the body because the brain and the body are constantly communicating with each other.” 

What happens in the brain during stress and anxiety? 

Stress is usually tied to a specific situation, while anxiety can continue even when there is no immediate threat. When something feels stressful or threatening, your brain quickly evaluates whether you may be in danger. Several areas of the brain are involved, including the amygdala, which helps detect threats, and the hypothalamus, which helps activate the body’s stress response. 

Once that response begins, the sympathetic nervous system activates the fight-or-flight response. Your body produces stress hormones, including adrenaline and cortisol, to prepare you to act. This can make your heart beat faster, your breathing speed up and your muscles tense. 

This response occurs even when the threat is not physical. A call from your child’s school, a difficult conversation, financial stress, a work deadline or a health concern can all activate the same internal alarm system. 

Why does your stomach drop? 

That sudden sinking feeling in your stomach is linked to how stress affects digestion. During moments of stress, the body focuses on systems that help you respond quickly. Blood flow and energy shift toward your heart, lungs and muscles, and digestion may slow down or feel disrupted. 

“That shift may result in nausea, stomach tightness, cramping, loss of appetite or the sensation that your stomach has dropped,” said O’Brien. “Stress and anxiety can also affect the gut because the brain and digestive system are closely connected.” 

For some people, stomach symptoms are among the first signs of anxiety, even before they recognize the emotion itself. 

Why does your heart race? 

A faster heartbeat is another common part of the stress response. When adrenaline levels rise, your heart pumps more quickly to move oxygen-rich blood to your muscles and brain, helping you stay alert and ready to respond. 

You may also notice rapid breathing, sweating, trembling, dizziness or tightness in your chest. These symptoms can overlap with anxiety and panic symptoms, which can make the experience feel frightening. 

Although these sensations can be part of anxiety, chest pain, fainting, severe shortness of breath or symptoms that feel new or unusual should be evaluated right away. When in doubt, seek medical care. 

When to seek support for stress and anxiety 

Everyone experiences stress and anxiety from time to time. If your body often feels on high alert, it may be time to talk with your doctor or a behavioral health specialist. 

You should also seek support if you experience panic attacks, use alcohol or substances to cope or feel hopeless, unsafe or unable to function. 

If you are thinking about harming yourself or someone else, call or text 9-8-8 to reach the Suicide and Crisis Lifeline or call 9-1-1 for immediate emergency help. 

Help is available 

Stress and anxiety can feel isolating, especially when symptoms show up in your body. But these reactions are common and treatable. “Behavioral health support can help you understand what is happening, identify triggers and build coping strategies that work for your life,” said O’Brien. 

Treatment may include therapy, medication, lifestyle changes or a combination of approaches. The right support depends on your symptoms, health history and personal needs. 

Your racing heart and dropping stomach are not signs of weakness. They are signs that your body is responding to stress. With the right tools and support, you can learn how to calm that response and feel more in control.

Learn about behavioral and mental health services at Inspira.