It’s inevitable that we experience bodily discomfort from time to time. Often, minor symptoms that seem normal are overlooked as they’re assumed to be temporary issues. However, these seemingly insignificant signs could be health “red flags,” indicating potential autonomic nervous system disorders. This is not a rare condition but a silent killer that gradually diminishes one’s quality of life. Here are three subtle signs of autonomic nervous system dysfunction that you should pay attention to.
1. Unexplained Rapid Heart Rate and Chest Discomfort – Easily Mistaken for “Work Pressure”
In our hectic lives, many of us have experienced feelings of nervousness and chest discomfort, especially when stressed or sleep-deprived. Most attribute these sensations to stress or lack of rest. However, if you frequently experience a rapid heart rate and chest heaviness, even during rest and relaxation, it could indicate an autonomic nervous system disorder.

The autonomic nervous system, comprising the sympathetic and parasympathetic nervous systems, regulates cardiovascular function. When imbalanced, overactivity of the sympathetic nervous system leads to a rapid heart rate and strong contractions, resulting in feelings of nervousness and chest discomfort. For instance, a 35-year-old office worker who had been overworking for several months experienced rapid heart rate and chest discomfort, initially attributed to work pressure. However, upon examination, it was discovered to be caused by an autonomic nervous system disorder.
2. Prolonged Insomnia and Vivid Dreams – Often Misinterpreted as “Common Sleeplessness”
Sleep is a time for the body to rejuvenate, but many individuals struggle with prolonged insomnia and vivid dreams. They often blame their phone usage before bed, a noisy environment, or an unsuitable schedule, attempting improvements without success. In reality, autonomic nervous system disorders can severely disrupt sleep patterns.
The autonomic nervous system regulates our biological clock and sleep cycles. When it malfunctions, the nervous system becomes overstimulated, making it challenging for the brain to relax. Consequently, individuals toss and turn, struggle to fall asleep, and wake up frequently during the night, resulting in interrupted sleep. This vicious cycle aggravates the autonomic nervous system disorder, impacting work productivity and overall health.

3. Persistent Digestive Issues – Mistaken for “Common Gastritis”
If you frequently experience stomach upset, stomach pain, loss of appetite, diarrhea, or constipation, you may attribute these symptoms to food hygiene issues or mild gastritis and resort to self-medication. However, if digestive symptoms recur without any detectable organic lesions upon examination, it could indicate “functional bowel disorder,” a manifestation of autonomic nervous system dysfunction.
The autonomic nervous system plays a crucial role in controlling intestinal peristalsis and digestive juice secretion. When this system malfunctions, digestive function is affected, leading to symptoms such as stomach pain, diarrhea, and irregular constipation. For instance, when emotionally stressed, some individuals suddenly experience intense stomach pain or diarrhea, which are digestive manifestations caused by autonomic nervous system dysfunction.