If you’re struggling to have a bowel movement, the most likely culprits are not drinking enough water, not eating enough fiber, sitting too long without moving, or a side effect of something you’re taking. Constipation is one of the most common digestive complaints, and in most cases, the fix is straightforward once you identify what’s working against you.
Clinically, constipation means straining during more than a quarter of your bowel movements, passing hard or lumpy stools, or feeling like you haven’t fully emptied. If your stool looks like separate hard pebbles or a lumpy log (types 1 and 2 on the Bristol Stool Chart), it’s spent too long in your intestines and lost too much water along the way.
You’re Probably Not Eating Enough Fiber
Fiber is what gives stool its bulk and softness. Without enough of it, waste moves slowly through your colon, drying out and hardening as it goes. Current dietary guidelines recommend 14 grams of fiber for every 1,000 calories you eat, which works out to roughly 25 to 30 grams a day for most adults. The average American gets about half that.
Soluble fiber (found in oats, beans, apples, and flaxseed) draws water into your stool and makes it softer. Insoluble fiber (found in whole grains, nuts, and vegetable skins) adds bulk and helps push everything along. You need both. If you’re going to increase your fiber intake, do it gradually over a week or two. Adding too much at once can cause bloating and gas, which makes the whole situation feel worse before it gets better.
Dehydration Makes Everything Harder
Your colon’s job is to absorb water from digested food. When you’re not drinking enough, your body pulls extra water from your stool to compensate, leaving behind dry, hard waste that’s difficult to pass. Low water intake is consistently associated with harder stools, lower stool weight, and a higher rate of constipation. This doesn’t mean that chugging extra water will cure constipation if you’re already well-hydrated, but if your intake is low, increasing it can make a real difference. A reasonable target is around eight glasses a day, adjusted upward if you exercise, live in a hot climate, or drink a lot of caffeine.
Medications That Slow Your Gut
A surprising number of common medications cause constipation as a side effect. The major ones include:
- Opioid pain medications: these slow the entire digestive tract significantly
- Antacids containing calcium or aluminum
- Antidepressants, particularly older types
- Some blood pressure medications
- Antihistamines (cold and allergy medicines)
- Iron and calcium supplements
If your constipation started around the same time you began a new medication, that’s probably not a coincidence. Don’t stop taking a prescribed medication on your own, but it’s worth a conversation with your prescriber about alternatives or adding something to counteract the effect.
Your Pelvic Floor Might Not Be Cooperating
Sometimes the problem isn’t what’s happening in your colon. It’s what’s happening at the exit. A condition called dyssynergic defecation means the muscles around your rectum aren’t coordinating properly when you try to go. Normally, the muscles that hold stool in should relax when you bear down. In people with this condition, those muscles tighten instead of relaxing, essentially closing the door while you’re trying to push something through it. About half of people with this problem also have a reduced ability to feel when stool is ready to pass, so the urge itself is muted.
This is more common than most people realize and often gets misdiagnosed as simple constipation. If you’ve tried fiber, water, and laxatives without improvement, this is worth investigating. Diagnosis typically starts with a physical exam, and the condition responds well to a specific type of physical therapy called biofeedback training, where you learn to retrain those muscles.
Your Sitting Position Matters
The angle between your rectum and anal canal changes depending on how you sit. On a standard toilet, your body creates a partial kink that makes evacuation harder. When you squat, or simulate squatting by elevating your feet on a stool, the pelvic floor muscles relax and the passage straightens out. A footstool that raises your knees above your hips (roughly 7 to 9 inches tall) can make a noticeable difference, especially if you tend to strain. Lean slightly forward with your elbows on your knees and let your belly relax.
What Actually Helps Right Now
If you need relief today, over-the-counter laxatives come in three main types, each working differently and on a different timeline.
Bulk-forming laxatives (like psyllium husk) work the same way dietary fiber does. They absorb water and make your stool bigger and softer, which triggers your colon to contract and push things along. They’re the gentlest option but the slowest, taking anywhere from 12 hours to three days to work.
Osmotic laxatives (like polyethylene glycol or magnesium citrate) pull water into your colon from surrounding tissue, softening what’s already there. Standard osmotic types take one to three days. Salt-based versions like magnesium citrate act faster, sometimes within 30 minutes to six hours. These are effective for occasional use but can cause cramping if you’re not drinking enough water alongside them.
Stimulant laxatives (like bisacodyl or senna) activate the nerves in your colon wall, forcing the muscles to contract and move stool out. They typically work within 6 to 12 hours and are best reserved for occasional use rather than daily reliance.
For a longer-term fix, focus on the basics: more fiber-rich foods, more water, and more physical movement throughout the day. Even a daily walk helps stimulate the natural contractions that keep your colon on schedule. Try to respond to the urge when it comes rather than putting it off. Ignoring the signal repeatedly can dull it over time, making the problem self-reinforcing.
Signs Something More Serious Is Going On
Most constipation is uncomfortable but not dangerous. However, certain symptoms alongside constipation signal that something needs medical attention. Blood in your stool, unexplained weight loss, or vomiting combined with an inability to pass stool are all warning signs. If you haven’t had a bowel movement for a prolonged stretch and you’re also experiencing severe abdominal pain or major bloating, that could indicate a bowel obstruction, which is a medical emergency. New-onset constipation in someone over 50 who has never had issues before also warrants investigation to rule out structural causes.