Green Stool: Causes and Concerns for Adults - Internal Medicine

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Regarding green stool?


Hello Doctor, I would like to ask about something.
For the past two days, I have been experiencing green stools and I also feel very tired every day.
I read online that sometimes infants have green stools due to the ingredients in formula milk, and I recently started using formula.
Could this be the reason, or could there be other possible causes? Since it has been two days, I am a bit worried.
As for feeling tired every day, I usually sleep for seven to nine hours each night, which should be enough sleep.
Is there a connection between the two issues? Thank you for your help, and happy Mid-Autumn Festival!

Xiao Ming, 20~29 year old female. Ask Date: 2004/09/25

Dr. Chen Jingwen reply Internal Medicine


Possible causes of green stools: 1.
Food: Such as consuming a lot of dark-colored fruits and vegetables.
2.
Medications: Such as iron supplements, and possibly dark green infant formulas that contain high iron content.
3.
Bile pigments: Conditions that secrete more bile pigments into the intestine, such as acute or chronic hepatitis, cirrhosis, liver cancer, and cholelithiasis, may result in dark brown-green or yellow-green stools.
4.
Occult blood can lead to dark brown-green stools, which may indicate bleeding in the oral cavity, esophagus, or gastrointestinal tract.
Testing stool and correlating with other clinical symptoms can help identify the cause.
Recommendation: It is advisable to consult an internal medicine or gastroenterology clinic for further evaluation.

Reply Date: 2004/09/25

More Info


Green stool in adults can be a concerning symptom, and it's understandable that you're feeling anxious about it, especially since you've noticed it occurring for two consecutive days. There are several potential causes for green stool, and while some may be benign, others could indicate underlying health issues.

One common reason for green stool is dietary changes. Foods that are high in chlorophyll, such as leafy greens (spinach, kale), or foods with artificial coloring can lead to green stool. Additionally, if you've recently started consuming more dairy products, such as formula milk, it could also contribute to changes in your stool color. Formula milk can sometimes lead to changes in digestion and stool consistency, especially if your body is adjusting to it.

Another possibility is that the green color could be due to the rapid transit of food through your intestines. If food moves too quickly through the digestive tract, bile (which is green) may not have enough time to break down completely, resulting in green stool. This can happen due to various reasons, including gastrointestinal infections, stress, or even certain medications.

In some cases, green stool can indicate an imbalance in gut bacteria or a malabsorption issue, where your body is not absorbing nutrients effectively. This could be linked to conditions such as celiac disease or irritable bowel syndrome (IBS). If you have any additional symptoms, such as abdominal pain, diarrhea, or changes in appetite, it would be wise to consult a healthcare professional for a thorough evaluation.

Regarding your fatigue, feeling tired despite getting adequate sleep can be attributed to several factors. Stress, anxiety, or depression can significantly impact your energy levels and overall well-being. Additionally, if your body is fighting an infection or dealing with digestive issues, it may require more energy, leading to feelings of fatigue. It's essential to consider your overall lifestyle, including diet, hydration, and physical activity, as these can all influence your energy levels.

If the green stool persists for more than a few days, or if you experience other concerning symptoms such as severe abdominal pain, blood in your stool, or significant changes in your bowel habits, it's crucial to seek medical attention. A healthcare provider can perform tests to determine the underlying cause and recommend appropriate treatment.

In summary, while green stool can be caused by dietary changes, it can also indicate other health issues. Your fatigue may be related to stress or an underlying condition. Monitoring your symptoms and consulting a healthcare professional if they persist will help ensure that any potential issues are addressed promptly. Remember to take care of your mental health as well, as stress and anxiety can significantly impact your physical health.

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