Bowel Issues: Morning Regularity and Evening Constipation - Gastroenterology and Hepatology

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Bowel issues, normal bowel movement in the morning, constipation in the evening?


I almost have a bowel movement twice a day; I always have one in the morning.
However, this month, there have been 2 to 3 instances where I felt the urge to go at around 11 PM but couldn't.
Even with straining, I couldn't pass it.
However, I do have a bowel movement the next morning, and then I experience the urge again in the afternoon or evening but can't go.
The following morning, I usually have normal bowel movements 1 to 2 times.
My stool is almost always golden yellow.
I tend to get anxious and have an anxiety disorder, as well as irritable bowel syndrome (I used to have diarrhea frequently).
I had a gastrointestinal endoscopy last May (I usually have one every 2 to 3 years), and everything was fine.
What could this be? Because of a minor issue, I tend to search for information online, and the more I read, the more frightening it becomes.
I also have autonomic nervous system dysregulation, and I think I might have illness anxiety disorder.

Kai, 30~39 year old female. Ask Date: 2017/08/17

Dr. Chen Qifeng reply Gastroenterology and Hepatology


It is primarily a gastrointestinal functional disorder, and you may consult a gastroenterologist.

Reply Date: 2017/08/17

More Info


Understanding bowel issues, particularly regarding morning regularity and evening constipation, can be complex and multifaceted. Based on your description, it seems you experience a consistent pattern of bowel movements in the morning, but occasionally face difficulties with constipation in the evening. This situation can be influenced by several factors, including diet, stress, and underlying gastrointestinal conditions.

Firstly, it's important to recognize that bowel habits can vary significantly from person to person. The fact that you typically have bowel movements in the morning is quite common, as many people experience a natural urge to defecate after waking up. This phenomenon is often referred to as the "gastrocolic reflex," where the act of eating or even the anticipation of food stimulates the colon to contract, leading to a bowel movement. However, your experience of having difficulty passing stool in the evening, despite feeling the urge, may indicate a few underlying issues.

One potential factor is your anxiety and history of irritable bowel syndrome (IBS). Stress and anxiety can significantly impact gastrointestinal function, leading to symptoms such as constipation or diarrhea. In your case, the anxiety may be contributing to a heightened sensitivity in your gut, making it difficult for you to relax and have a bowel movement when you feel the urge in the evening. This could explain why you find it easier to have a bowel movement in the morning when you are likely more relaxed and less anxious.

Additionally, your eating habits may play a role. If you are experiencing constipation in the evening, it could be related to your dietary intake throughout the day. A diet low in fiber can lead to harder stools and difficulty passing them. Since you mentioned that you often eat only two meals a day, it’s crucial to ensure that these meals are balanced and include sufficient fiber from fruits, vegetables, and whole grains. Staying hydrated is also essential, as adequate fluid intake helps soften stool and promotes regular bowel movements.

Another consideration is your sleep patterns and the timing of your meals. Eating late at night, especially heavy or rich foods, can lead to digestive discomfort and may affect your bowel movements the following day. If you are eating close to bedtime, it might be beneficial to adjust your eating schedule to allow for better digestion before sleep. Ideally, try to finish eating at least two to three hours before going to bed.

Your previous gastrointestinal evaluations, including the colonoscopy, have shown no significant issues, which is reassuring. However, if your symptoms persist or worsen, it may be worth revisiting your healthcare provider for further evaluation. They may suggest additional tests or treatments to help manage your symptoms effectively.

Lastly, it’s essential to address your concerns about health anxiety and the tendency to search for information online. While it’s natural to seek answers, excessive research can often lead to increased anxiety and fear. Consider discussing these feelings with a mental health professional who can provide strategies to manage anxiety and help you feel more in control of your health.

In summary, your bowel issues may be influenced by a combination of anxiety, dietary habits, and the timing of your meals. Focusing on a balanced diet rich in fiber, staying hydrated, managing stress, and adjusting your eating schedule may help alleviate some of your symptoms. If problems persist, seeking guidance from a healthcare professional is advisable to ensure your gastrointestinal health remains optimal.

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