Chronic Constipation Is Not Just a Lazy Gut: The Gut–Brain Axis
I do not know how many times I have heard this sentence during my career as a physician. Then, most of the time, a similar story follows: “I drink plenty of water, I eat a high-fiber diet, I have taken probiotics. I can go when I take a medication, but when I stop, it is the same again.”
This is exactly the point at which we need to stop and ask: Why?
Why can one person's bowels keep their own rhythm, while in another that rhythm is lost over the years? Because if we see chronic constipation merely as stool moving slowly through the intestine, we miss an important part of the story the human body is trying to tell us.
The gut is not a passive tube through which food passes. It is a complex organ that senses, responds, lives together with microorganisms and communicates with the nervous system without interruption. Moreover, it has a nervous network of its own.
The Gut Has a Nervous System Too
In the wall of the digestive tract there is a vast network made up of millions of nerve cells. We call this the enteric nervous system. Although calling it the “second brain” in everyday speech may seem a little bold, there is an important truth behind this analogy: the gut can regulate its movements and secretions largely through its own local neural networks.
We do not think, “Now let the gut work.” It regulates, within its own physiology, when to contract, when to relax and in which direction to move its contents.
But it is not alone. It is in constant conversation with the brain.
The Gut–Brain Axis: Why Does Stress Silence the Gut?
We call this two-way communication between the gut and the brain the gut–brain axis. The autonomic nervous system is one of the important pathways of this relationship. The shifting balance between the sympathetic and parasympathetic systems can influence intestinal movement, secretions, blood flow and digestive functions.
It is therefore not surprising that our bowels change after a heavy argument, an important exam, prolonged anxiety or a period when life weighs heavily on us. Some people get diarrhea, while for others the bowels go almost silent.
Because stress is not merely a feeling experienced in the mind. It is a biological response of the entire organism. The heart speeds up, breathing changes, muscle tone increases, sleep is disturbed. The gut does not stay outside this picture.
That is why, when evaluating chronic constipation, asking only “What do you eat?” has never felt sufficient to me.
Sometimes the real question is: “How do you live?”
The Microbiota: We Are Not Alone in the Gut
Another important part of the story is the microbiota. Our intestines are home to a huge community of microorganisms. This ecosystem interacts reciprocally with digestion, metabolism, the gut barrier and the immune system. We call the disruption of this balance dysbiosis.
In recent years, the relationship between chronic constipation and changes in the microbiota has been increasingly studied. However, we should not jump to an easy conclusion here. Not every constipation is caused by dysbiosis, and not every dysbiosis causes constipation.
Nevertheless, the microbiota is a living ecosystem that plays a role in forming metabolites, bile acids and short-chain fatty acids related to intestinal movement. In other words, the microorganisms living in the gut are not just guests of what we eat. They are active members of that environment.
Does Constipation Cause Dysbiosis, or Dysbiosis Constipation?
Here a classic question arises: Does dysbiosis increase constipation, or does constipation increase dysbiosis?
In some patients the answer is probably both.
When intestinal transit slows down, the length of time the contents stay in the gut changes. This also changes the environment in which the microorganisms live. As the microbial composition and the metabolites produced change, the neural, metabolic and immune communication in the gut wall can be affected. A self-perpetuating cycle can thus form.
How Does Regulatory Medicine Look at Chronic Constipation?
This is exactly where regulatory medicine is interested: not blaming a single part, but understanding how the cycle forms.
Because the body often speaks. The question is how much we listen to it.
You can find neural therapy and Hüseyin Nazlıkul's other treatment methods here.