08/06/2016
Chronic constipation is a common and often uncomfortable condition that affects millions of people across the UK. While it might feel like an isolated issue, understanding the intricate workings of your digestive system is the first crucial step towards effective management and relief. This guide aims to demystify bowel function and provide actionable advice for those experiencing long-term constipation, helping you regain control and improve your overall well-being.
Understanding Normal Bowel Function
The human digestive system is a marvel of biological engineering, designed to efficiently process food, absorb nutrients, and eliminate waste. While the frequency of bowel movements can vary significantly from person to person – ranging anywhere from three times a day to once every three days – what’s consistent is the fundamental process that underpins this vital bodily function.
The Journey Through the Gut
Digestion begins long before food reaches your bowels. Once food is broken down in the stomach, it enters the small intestine, where the majority of nutrient absorption into the bloodstream occurs. What remains – a mix of water, undigested food residues, salts, and a vast array of bacteria – then makes its way into the large intestine, or colon.
The large intestine is a crucial player in the final stages of digestion. It typically receives between one and two litres of breakdown products each day. This material can reside in the large intestine for one to three days. A primary function of the large intestine is to absorb most of the remaining water from the chyme, transforming the liquid contents into a more solid form – faeces. Without adequate water absorption, stools would remain too liquid, leading to diarrhoea. Conversely, excessive water absorption, often due to prolonged transit time, results in hard, difficult-to-pass stools.
The Role of Mass Movements and Reflexes
The movement of contents through the large intestine isn't a continuous flow but rather a series of coordinated contractions known as mass movements. These are powerful, wave-like contractions that propel the faecal matter along the entire length of the large intestine towards the rectum. When the rectum fills with faeces, sensory nerves send signals to the brain, creating the conscious sensation and urge to defecate.
An important physiological response that aids bowel regularity is the gastrocolic reflex. This reflex is stimulated by the act of eating, particularly the first meal of the day, and by physical activity. It triggers contractions in the colon, encouraging the movement of faeces. Capitalising on this natural reflex by attempting a bowel movement shortly after breakfast can be a highly effective strategy for promoting regular evacuation.
The Mechanics of Defecation
When the urge to defecate arises, and it's a suitable time and place, a complex interplay of muscles and nerves facilitates the process. The inner anal sphincter, which is an involuntary muscle, relaxes. Simultaneously, the outer anal sphincter and the puborectalis muscle, both of which are under voluntary control, also relax. This relaxation helps to straighten the anorectal angle, allowing for the smooth passage of faeces from the rectum out of the body.
Normal sensitivity in the rectum allows us to differentiate between gas, liquid stool (diarrhoea), and solid stool, providing us with the necessary feedback to control our bowel movements. The ability to voluntarily relax or contract the outer sphincter and puborectalis muscle is what gives us the power to facilitate evacuation or to defer it until a more convenient moment.
Why Constipation Occurs: Breaking the Cycle
Given the complexity of the digestive system, it’s understandable that many factors can disrupt its normal rhythm, leading to constipation. One significant contributor is the habitual ignoring of the urge to defecate. When the signal to empty the bowels is repeatedly suppressed, the rectum can become less sensitive over time, requiring a greater volume of faeces to trigger the urge. Furthermore, the longer faeces remain in the large intestine, the more water is absorbed, making the stool progressively harder and more difficult to pass, thus perpetuating the cycle of constipation.
Beyond ignoring urges, other common causes include:
- Insufficient Fibre Intake: Fibre adds bulk to stool and helps it retain water, making it softer and easier to pass.
- Dehydration: Lack of fluids makes stools dry and hard.
- Lack of Physical Activity: Exercise stimulates bowel movements.
- Medications: Certain drugs, such as opioids, antidepressants, iron supplements, and some antihistamines, can cause constipation as a side effect.
- Changes in Routine: Travel, pregnancy, or changes in diet can temporarily disrupt bowel habits.
- Underlying Medical Conditions: Conditions like irritable bowel syndrome (IBS), diabetes, thyroid disorders, and neurological conditions can impact bowel function.
- Stress and Anxiety: The gut-brain axis means emotional stress can significantly affect digestion.
Strategies for Managing Chronic Constipation
Effective management of chronic constipation often involves a multi-pronged approach, combining lifestyle adjustments with targeted interventions.
Dietary Adjustments: The Fibre Factor
Increasing your dietary fibre intake is paramount. Aim for a gradual increase to allow your digestive system to adapt, preventing bloating or gas. There are two main types of fibre:
- Soluble Fibre: Dissolves in water to form a gel-like substance, helping to soften stool. Found in oats, barley, nuts, seeds, beans, lentils, and many fruits (apples, citrus fruits) and vegetables (carrots).
- Insoluble Fibre: Adds bulk to stool and helps it pass more quickly through the digestive tract. Found in whole grains, wheat bran, and the skins of fruits and vegetables.
A balanced intake of both types is ideal. Consider adding a tablespoon of ground flaxseeds to your daily routine, as they are rich in both fibre and omega-3 fatty acids.
Hydration: The Essential Lubricant
Water is crucial for softening stool and facilitating its passage. Aim to drink at least 8-10 glasses (around 2 litres) of fluids daily. This includes water, herbal teas, and diluted fruit juices. Remember that caffeinated drinks can have a dehydrating effect, so balance them with extra water intake.
The Power of Movement
Regular physical activity stimulates the natural contractions of the intestines, helping to move stool along. Even moderate exercise, such as a daily brisk walk for 30 minutes, can make a significant difference. If you're new to exercise, start slowly and gradually increase intensity and duration.
Establishing Healthy Bowel Habits
Creating a consistent routine can greatly aid regularity. Try to set aside a specific time each day for a bowel movement, ideally shortly after a meal to utilise the gastrocolic reflex. Don't rush the process, but also avoid prolonged straining. Listen to your body's signals and respond promptly when the urge arises; ignoring it can lead to harder stools and a less responsive bowel.
Optimising Toilet Posture
Believe it or not, the way you sit on the toilet can significantly impact the ease of evacuation. The modern toilet often places us in a position that kinks the anorectal angle, making it harder for the puborectalis muscle to relax fully. To enhance the natural process, consider these adjustments:
- Use a Footstool: Elevating your feet on a small footstool (around 6-8 inches high) while sitting on the toilet helps to raise your knees above your hips. This mimics a squatting position, which naturally straightens the anorectal angle and relaxes the puborectalis muscle, making it easier to pass stool without straining.
- Lean Forward: Lean forward slightly from your hips and rest your elbows on your knees. This posture can also help to apply gentle, natural pressure to the abdomen, further aiding evacuation.
This simple change in posture can be remarkably effective for many individuals struggling with constipation, reducing the need for excessive straining and preventing potential complications like haemorrhoids.
When to Consider Over-the-Counter Remedies
For some, lifestyle changes alone may not be enough. Over-the-counter laxatives can offer temporary relief, but they should be used judiciously and ideally under medical guidance, especially for chronic constipation. Different types of laxatives work in different ways:
- Bulk-forming laxatives: These add fibre and bulk to the stool, making it softer and easier to pass. Examples include Fybogel and Ispagel. They require plenty of fluids to work effectively.
- Osmotic laxatives: These draw water into the bowel, softening the stool. Examples include Lactulose and Macrogols (e.g., Movicol).
- Stimulant laxatives: These stimulate the muscles in the bowel to contract. Examples include Senna and Bisacodyl. They are generally not recommended for long-term use as they can lead to dependency and a 'lazy' bowel.
Always read the label and follow dosage instructions. Prolonged use of stimulant laxatives can be detrimental, and it's essential to address the root causes of constipation rather than relying solely on medication.
Comparative Table: Normal vs. Constipated Bowel Movements
| Feature | Normal Bowel Movement | Constipated Bowel Movement |
|---|---|---|
| Frequency | 3 times/day to 1 time/3 days | Less than 3 times/week |
| Stool Consistency (Bristol Scale) | Types 3 or 4 (like a sausage, smooth or with cracks) | Types 1 or 2 (hard lumps, sausage-shaped but lumpy) |
| Effort | Easy to pass, no straining | Requires significant straining, painful |
| Feeling After | Complete emptying, comfortable | Incomplete emptying, discomfort, bloating |
| Urge | Clear, consistent signal | Infrequent, weak, or absent signal |
Frequently Asked Questions About Constipation
Q: How much fibre should I aim for daily?
A: Adults in the UK are advised to consume around 30 grams of fibre per day. Most people fall short of this target. Gradually increasing your intake through whole grains, fruits, vegetables, and legumes is recommended.
Q: Is it normal to not go every day?
A: Yes, absolutely. As discussed, bowel movement frequency varies widely. As long as your stools are soft, easy to pass, and you don't experience discomfort, going every few days can be perfectly normal for you.
Q: Can stress cause constipation?
A: Yes, the gut and brain are intimately connected. Stress, anxiety, and depression can all influence gut motility and lead to digestive issues, including constipation.
Q: When should I see a doctor for constipation?
A: It's advisable to consult your GP if your constipation is new, severe, persistent (lasting more than a few weeks), or if it's accompanied by other symptoms like unexplained weight loss, blood in your stool, severe abdominal pain, or alternating constipation and diarrhoea. These could indicate an underlying medical condition that requires professional assessment.
Q: Are coffee and tea good for constipation?
A: While caffeine can stimulate bowel movements for some due to its laxative effect, it can also be dehydrating. Therefore, if you rely on coffee or tea, ensure you balance it with plenty of water to avoid counteracting its potential benefits.
Conclusion
Chronic constipation can be a distressing condition, but understanding the mechanisms of your digestive system and implementing consistent lifestyle changes can significantly improve your symptoms. From dietary adjustments and proper hydration to regular exercise and optimising your toilet posture, proactive steps can lead to greater comfort and regularity. Remember, if your symptoms persist or worsen, or if you have any concerns, always consult a healthcare professional for personalised advice and to rule out any underlying issues. Taking charge of your bowel health is a vital step towards enhancing your overall quality of life.
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