Whether you feel tense and stressed or calm and balanced depends primarily on your autonomic—or vegetative— nervous system. More specifically , it’s the interaction between the sympathetic and parasympathetic nervous systems, which together control the autonomic nervous system. The sympathetic nervous system becomes active when your body needs to perform: It increases alertness, boosts energy, and puts you in a state of activity. The parasympathetic nervous system, on the other hand, promotes relaxation, regeneration, and regulation.
In everyday life, however, these two systems often become unbalanced. Constant strain, insufficient rest, and high stress levels can lead to prolonged activation of the sympathetic nervous system. The result is often an imbalance in which the parasympathetic nervous system is underactive. This can manifest as sleep problems, inner restlessness, or digestive issues.
This is exactly where it becomes important to specifically activate the parasympathetic nervous system and calm the sympathetic nervous system in order to restore balance to the autonomic nervous system.
What is the sympathetic nervous system, and what role does it play in the autonomic nervous system?
The sympathetic nervous system ( a technical term in anatomy) is also known as the sympathetic nervous system and is an important component of the autonomic nervous system. It takes control whenever your body needs to become active. It is primarily activated in situations that require increased attention, performance, or quick reactions. This form of sympathetic activation ensures that your body can make more energy available in the short term. This occurs through an increased heart rate, faster breathing, and improved blood flow to the muscles.
In conjunction with the parasympathetic nervous system, the sympathetic nervous system acts as an “accelerator.” While the parasympathetic nervous system is responsible for rest and recovery, the sympathetic nervous system promotes activity and readiness to perform. Both systems work closely together and alternate depending on the situation to adapt optimally.
However, if the sympathetic nervous system remains overactive for an extended period—as can happen, for example, with chronic stress—this can prevent the body from recovering adequately, with far-reaching effects on energy levels, performance, and well-being.
What is the parasympathetic nervous system, and what is its function in the body?
The parasympathetic nervous system is the counterpart to the sympathetic nervous system and, within the autonomic nervous system, plays a role in regeneration and recovery, among other things. It becomes active primarily when your body is at rest. In this state, processes take place that are crucial for long-term health—often summarized under the principle of “Rest & Digest.” The function of the parasympathetic nervous system ensures that energy is not only expended but also replenished.
When the parasympathetic nervous system is active, the heart rate slows, breathing becomes calmer, and digestion is stimulated. At the same time, repair and regeneration processes in the body are supported. Sleep quality and the immune system are also closely linked to a properly functioning parasympathetic nervous system. When this part of the nervous system is sufficiently active, the body can better cope with stress and recover more quickly.
That is precisely why it is so important to specifically activate the parasympathetic nervous system. Because only when relaxation and activity are in balance will the autonomic nervous system remain stable—and with it, your energy levels and overall well-being.
How does an imbalance between the sympathetic and parasympathetic nervous systems develop?
An imbalance between the sympathetic and parasympathetic nervous systems usually develops gradually and is often the result of a chronically overloaded nervous system. When the body remains in “active mode” for an extended period without sufficiently shifting into a state of recovery, the sympathetic nervous system becomes persistently activated. As a result, the parasympathetic nervous system—which is responsible for rest and balance—is increasingly pushed into the background.
Typical causes of such an imbalance include:
- Chronic stress and constant pressure to perform
- Lack of sleep or irregular sleep patterns
- Sensory overload caused by screen time, noise, or constant availability
- Lack of exercise or one-sided physical strain
- A lack of breaks and recovery periods that are too short in everyday life
These factors can lead to chronic overactivity of the sympathetic nervous system, causing the body to remain in a state of alert even when there is no acute danger. The consequences often develop gradually: inner restlessness, exhaustion, difficulty concentrating, or digestive problems can be early signs. In the long term, this imbalance impairs both physical and mental performance and hinders sustainable recovery.
How can you activate the parasympathetic nervous system and regulate the nervous system?
Activating the parasympathetic nervous system means consciously sending signals of calm and safety to the body. In everyday life, this is often the key to restoring balance to a stressed nervous system. While the sympathetic nervous system reacts automatically to stress, the parasympathetic nervous system often needs specific stimuli to become more active and exert its regenerative effects.
There are a few simple steps you can take to gently regulate your nervous system. Relaxing breathing exercises—especially those that involve prolonged exhalation—have proven to be particularly effective. Establishing consistent daily routines can also help bring the body into a state of relaxation. These include taking intentional breaks free from distractions or engaging in relaxing evening rituals that signal to the body that it’s time to wind down.
Consistency is key here. The more often you send these signals to your body, the easier it is for it to switch to recovery mode and stabilize its nervous system over the long term.
How can you calm the sympathetic nervous system and reduce stress in the long term?
Calming the sympathetic nervous system means deliberately reducing its constant activation in everyday life. The body is often under sustained tension without sufficient periods of rest. This makes it all the more important to consciously take steps to regulate stress—not just in the short term, but over the long term.
One approach is to incorporate breaks and longer periods of rest into your daily routine. Exercise can also help relieve built-up tension and take the strain off the autonomic nervous system. At the same time, mindfulness plays an important role: fewer stimuli, intentional breaks, and set routines help your body recover from chronic stress.
Effective ways to calm the sympathetic nervous system:
- Regular Breaks in Everyday Life
- Physical activity, such as walks in nature
- Reducing stimuli such as screen time
- Mindful Routines for Greater Balance
This allows the autonomic nervous system to stabilize over the long term and switch more effectively between activity and rest.
Vagus Nerve Stimulation—How Does It Support the Parasympathetic Nervous System?
The vagus nerve is the largest parasympathetic nerve in the body. It connects the brain to the organs and influences numerous processes. From heart rate and breathing to digestion. When the vagus nerve is activated, it sends signals of calm and safety to the body, thereby helping to strengthen the parasympathetic nervous system.
Especially when dealing with stress or other emotional imbalances , targeted vagus nerve stimulation can help calm the autonomic nervous system. This does not involve complex methods, but rather often simple stimuli that stimulate the nerve and thereby trigger a relaxation response.
Proven methods for stimulating the vagus nerve include:
- Deep, slow breathing, especially with prolonged exhalation
- Cold stimuli, such as cold water on the face
- Humming or singing, as this directly stimulates the vagus nerve
- Mindfulness and Relaxation Exercises
A well-regulated vagus nerve affects not only stress levels and emotional balance, but also digestion and overall well-being. By stimulating it regularly, you can train your body to switch to a state of relaxation more quickly.
Conclusion: Balancing the sympathetic and parasympathetic nervous systems
A balanced nervous system is crucial for your physical and mental well-being. The sympathetic nervous system promotes activity, performance, and quick reactions, while the parasympathetic nervous system regulates recovery, relaxation, and regenerative processes . It is only through the interaction of both systems that the necessary balance is achieved, which your body needs to remain healthy and perform at its best over the long term.
In everyday life, however, this balance is easily disrupted. Chronic stress, sensory overload, and a lack of rest quickly lead to sustained activation of the sympathetic nervous system. This makes it all the more important to take targeted countermeasures: to calm the sympathetic nervous system while simultaneously activating the parasympathetic nervous system. Methods such as breathing exercises, light exercise, mindfulness, or vagus nerve stimulation can help restore balance to the autonomic nervous system.
In the long run, it’s not about individual measures, but about consciously managing stress and recovery. In this way, a healthy balance can gradually develop, bringing energy and inner peace into harmony.
Sources
- Waxenbaum, J. A., et al. *Anatomy, Autonomic Nervous System*. StatPearls Publishing, Treasure Island (FL). https://www.ncbi.nlm.nih.gov/books/NBK539845/
- Austelle C. W. et al. Vagus nerve stimulation (VNS): recent advances and future directions. Clinical Autonomic Research. 2024;131:1215–1238. https://doi.org/10.1007/s10286-024-01065-w
