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Stool is thin. Causes and reasons? | Incheon constipation incomplete evacuation feeling
Blog July 6, 2025

Stool is thin. Causes and reasons? | Incheon constipation incomplete evacuation feeling

Dr. Yeonseung Choe
Dr. Yeonseung Choe
Chief Director

Hello. This is Baekrokdam Korean Medicine Clinic.

Sometimes patients speak to me cautiously.

"Doctor, my stools have been a bit thin lately. My stomach feels cold, and it doesn't feel refreshing... they come out, but it's strange."

You should not simply overlook these words. Being 'thin' is not just a matter of shape; it can be a signal that some flow inside the body has stopped.

What exactly does 'thin' mean?

Listening to patients in the consultation room, it is usually one of two things.

  1. Hard and thin:Short, fragmented, and a feeling like it comes out with a 'thud' when pressed. This is a state where the stool has stayed in the intestines for too long and dried up. Water is lost, it becomes hard, and the lumps become small. Eventually, it may break apart like rabbit droppings. This means the intestines have slowed down. It could be a signal that there is a lack of energy, a deficiency of fluids, or that the large intestine itself is too exhausted.
  2. Mushy but thin:The stomach hurts, and it feels like it's about to come out but doesn't, eventually coming out in small bits as if being squeezed like ketchup. This is a case where the stool is formed, but the exit is blocked. This often appears when the anal sphincter is excessively tense, or when the rectum cannot push it all the way out. It also occurs when one is under stress for a long time, when the pelvic floor muscles are tense, or when the bowel movement posture itself is poor.

What is the feeling of incomplete evacuation?

That is why people say things like: "It's not refreshing." "My stomach still feels bloated." "I keep wanting to go, but when I actually go, it doesn't come out well." This is called the feeling of incomplete evacuation (residual stool sensation).

This is not simply because something is left behind, but a 'sensation that evacuation was not completed.' While there are cases where stool actually remains, the problem lies in the brain not recognizing that 'it has all come out.' When this is repeated, the feedback loop between the brain and the intestines is damaged. Eventually, one always feels uncomfortable even while having a bowel movement and waits helplessly until the next one.

What is happening inside the large intestine?

It accumulates, hardens, and gradually spreads wider. It is not only in the rectum; it can fill up as if refluxing through the sigmoid colon to the descending colon, transverse colon, and in severe cases, to the ascending colon, cecum, and the end of the small intestine. When this happens, the entire intestine hardens like a stopped pipe. The abdomen swells up, eating becomes difficult, the stomach feels bloated, and burping becomes frequent. If it becomes more serious, the intestinal wall can be pressed and undergo necrosis, or there is a risk of intestinal contents piercing through the intestine. This can progress to a life-threatening situation.

Humans adapt to this state.

Even if one cannot have a bowel movement for 3 days, 5 days, or as long as 2 weeks or more, once the body becomes accustomed to that state, the urge to defecate itself becomes dull. The stomach is always uncomfortable, the mood sinks, and since it doesn't look like a major illness to others, one becomes more quietly isolated, and emotions accumulate inside. This is not a simple problem of excretion. The stopping of the body's flow means that the flow of life has also begun to be blocked. Eating, sleeping, movement, emotion, thought, and will—all of these begin to slow down and stagnate together.

Necessity of Treatment

Therefore, treatment should not simply be about making the stool come out, but about restoring the flow of the body. To make the intestines move, bulk is needed: fiber, moisture, and stimulation that induces intestinal peristalsis. To open the exit, the relaxation reflex of the sphincter, correct bowel movement posture, and the liberation of the pelvic floor muscles are necessary. Intestinal sensation must also be recovered—making one recognize the feeling of 'it's finished' after a bowel movement. And above all, it is important to recover the basic routine of eating three meals a day, sleeping consistently, walking, and moving.

From a Korean medicine perspective, people with weak energy need Bogi-unjang-beop (energy-tonifying intestinal strengthening method), people with dry intestines need Yunjang-ji-beop (intestinal moisturizing method), and people with severe tension need Haenggi-iwan (qi-circulating relaxation). Ultimately, because the pathology differs for each person, one must look at the flow, not just the symptoms.

Conclusion

Being 'thin' means narrow, but what that thin stool tells us is not a shallow problem. Within it are contained the state of the intestines, the reaction of the nerves, the stagnation of emotions, and even the flow of life. A wordless language the body sends us. What shows that most honestly is the once-a-day

bowel movements.

Therefore, the next time you have a bowel movement, take a look back to see if it was thin, soft, or if you felt refreshed. That may be the first thing to tell you how your body is living.

#thinstool #constipation #feelingofincompleteevacuation

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Dr. Yeonseung Choe

Dr. Yeonseung Choe Chief Director

I have met many patients who came after visiting multiple medical institutions and departments for persistent or recurrent conditions. Symptoms normally handled by different specialties—such as abdominal pain, headaches, palpitations, dizziness, and insomnia—may overlap in one person. Sometimes there is no clear improvement despite taking medication for each symptom, and being unwell gradually becomes part of daily life. In these cases, I look beyond individual diagnoses and examine how the symptoms connect and change together. Asking only about the most uncomfortable symptom today does not reveal the full course. I look at when the body first began to change and what happened after illness, surgery, childbirth, or starting and stopping medication. I also review changes in weight, diet, and sleep, then trace which symptoms improved with previous treatment and which remained. Test results, diagnoses, and the course of previous treatment are important for understanding the current condition. Clinical research in modern Korean medicine, physiological and pathological research in modern medicine, and observations recorded in classical Korean medicine texts offer different perspectives on the same body. Rather than fitting a patient into one perspective, I consider what each can and cannot explain and look for clues that connect symptoms and treatment histories that were previously considered separately.

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