Greenish Oily Stool: Causes and Concerns - Gastroenterology and Hepatology

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Excretion of a greenish-blue oily substance..?


Hello Doctor, I have been eating normally for the past two days and have not consumed any greenish foods.
However, I have been experiencing gurgling sounds in my lower abdomen and a persistent urge to pass gas.
When I tried to have a bowel movement, I did not feel the urge to defecate, but instead expelled a small amount of greenish, oily substance.
The quantity was minimal and appeared in small droplets.
There was no foul odor, just a sour smell similar to fermented food, and it floated on the surface of the water.
This has been ongoing for an entire day.
I would like to ask what these symptoms might indicate, as I am feeling quite distressed.
I would appreciate your prompt response.

Carrie, 20~29 year old female. Ask Date: 2005/01/12

Dr. Chen Zhiping reply Gastroenterology and Hepatology


Hello: The colors of normal stool that may raise concerns include blood in the stool (red), black stool (resembling tar), and grayish-white stool (similar to the color of white walls).
The first two indicate gastrointestinal bleeding, while grayish-white stool suggests bile duct obstruction.
Regarding your symptoms of small amounts of greenish stool, it is most likely a result of food being broken down and fermented by intestinal bacteria.
Please monitor the situation, and if it persists, seek medical attention for a stool examination.
Sincerely, Dr.
Chen Zhi-Ping, Internal Medicine.

Reply Date: 2005/01/12

More Info


Greenish oily stool can be a concerning symptom, and it’s understandable that you’re feeling worried about it. There are several potential causes for this condition, and it’s important to consider various factors that could be contributing to your symptoms.

Firstly, the color and consistency of your stool can be influenced by your diet. While you mentioned that you haven’t consumed any green foods recently, it’s worth noting that certain foods can still affect stool color. For example, foods high in fat or oils can lead to oily stools, especially if your body is not absorbing fats properly. This malabsorption can occur due to various gastrointestinal issues, such as pancreatitis, celiac disease, or other conditions affecting the pancreas or intestines.

The presence of greenish color in your stool could also be related to bile. Bile is a digestive fluid produced by the liver and stored in the gallbladder, and it can give stool a greenish hue if it passes through the intestines too quickly. This rapid transit can occur due to factors such as stress, anxiety, or gastrointestinal disturbances. Given that you mentioned experiencing gurgling sounds in your lower abdomen and a feeling of needing to pass gas, it’s possible that your digestive system is reacting to something, potentially related to anxiety or dietary changes.

Another important aspect to consider is the presence of oil in your stool. Oily stools can indicate a condition known as steatorrhea, which is characterized by excessive fat in the stool. This can be caused by malabsorption syndromes, where the body is unable to absorb nutrients effectively. Conditions such as chronic pancreatitis, cystic fibrosis, or certain infections can lead to this issue. The fact that your stool is floating and has an acidic smell may further suggest that it contains undigested fats.

In your case, the absence of a foul odor and the presence of an acidic smell could indicate that the stool is not fully decomposed, which might be a result of fermentation in the intestines. This could be due to an imbalance in gut bacteria or a reaction to certain foods, even if they are not green in color.

Given these possibilities, it’s crucial to monitor your symptoms closely. If the greenish oily stool persists, or if you experience additional symptoms such as abdominal pain, weight loss, or changes in appetite, it would be advisable to seek medical attention. A healthcare professional can perform a thorough evaluation, which may include stool tests, blood tests, or imaging studies to determine the underlying cause of your symptoms.

In the meantime, consider keeping a food diary to track what you eat and any symptoms that arise. This can help identify any potential triggers. Staying hydrated and maintaining a balanced diet rich in fiber can also support digestive health. If you suspect that anxiety or stress is contributing to your symptoms, exploring relaxation techniques or speaking with a mental health professional may be beneficial.

In summary, while greenish oily stool can be alarming, it can result from various factors, including dietary influences, malabsorption issues, or gastrointestinal disturbances. It’s important to pay attention to your body and seek medical advice if your symptoms do not improve or worsen over time.

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