Constipation is one of the most common reasons people visit a pharmacy, yet it's rarely talked about openly — most people quietly put up with it, try a random product off the shelf, or assume it will sort itself out. For many, it does. But knowing what's actually "normal", which self-care steps genuinely help, and which symptoms need a doctor's attention can save weeks of discomfort.

This guide covers what counts as constipation, the everyday things that cause it, the sequence UK pharmacists typically recommend trying treatments in, and the red-flag symptoms that mean it's time to stop self-treating and get checked.

What counts as constipation

There's no single "normal" bowel habit — some people naturally go three times a day, others three times a week, and both can be entirely healthy. Constipation is usually described as passing stools fewer than three times a week, alongside one or more of the following: stools that are hard, lumpy or difficult to pass, straining, or a feeling that you haven't fully emptied your bowels.

It's the combination of infrequency and these other features that matters, rather than frequency alone. Someone who goes daily but constantly strains and feels incompletely empty can still be constipated, while someone who goes every two or three days without difficulty usually isn't.

Common causes

Constipation is rarely caused by one single thing — it's usually a combination of everyday factors that build up:

  • Not enough fibre — diets low in fruit, vegetables, wholegrains and pulses mean less bulk to keep stools soft and moving.
  • Not drinking enough fluids — dehydration makes the bowel absorb more water from stool, leaving it harder and more difficult to pass.
  • Low activity levels — movement helps stimulate the bowel; long periods of inactivity, illness or bed rest commonly slow things down.
  • Ignoring the urge to go — routinely holding on, whether from a busy schedule or discomfort using public toilets, trains the bowel to signal less often over time.
  • Pregnancy — hormonal changes relax the bowel muscle, and later on the growing uterus can add physical pressure.
  • Certain medicines — opioid painkillers (such as codeine or morphine), iron supplements, some antidepressants, and certain antacids are well known to cause or worsen constipation.
  • Changes in routine — travel, a change in diet, or a new daily schedule can temporarily disrupt bowel habits.

Less commonly, constipation can be linked to an underlying condition such as an underactive thyroid, irritable bowel syndrome, or a bowel problem that needs specific investigation — one reason persistent or unusual symptoms are worth getting assessed rather than self-treating indefinitely.

It's also worth knowing that constipation is more common than many people expect, and affects people of all ages — from children who withhold going after a painful episode, to older adults where reduced mobility and multiple medicines often combine to slow the bowel. It's rarely a sign that something is seriously wrong, but it is genuinely uncomfortable, and it's a normal, common reason to ask a pharmacist or GP for advice rather than something to feel embarrassed about.

Self-care that helps first

For most people, constipation responds well to simple changes made consistently over a week or two, rather than any single quick fix:

  • Increase fibre gradually — aim for around 30g a day from sources such as wholegrain bread and cereals, oats, fruit, vegetables, beans and lentils. Adding fibre too quickly can cause bloating and wind, so build up over a week or two.
  • Drink more fluids — water and other non-alcoholic drinks help fibre do its job; aim for around 6–8 glasses a day unless you've been told to limit fluids for another health reason.
  • Move more — regular walking or other activity helps stimulate normal bowel movement.
  • Respond to the urge — try not to delay going, and allow unhurried time on the toilet, ideally after meals when the bowel's natural reflex is strongest.
  • Consider your position — raising your knees above hip height (for example, using a footstool) can make it easier to pass stools with less straining.

These measures can take several days to make a noticeable difference, so it's worth persisting rather than judging them on day one or two. A food and fluid diary for a few days can also be useful — it often reveals patterns, such as a habit of skipping breakfast or going long stretches without water, that are easy to overlook but straightforward to adjust once you can see them.

Laxative options and how they differ

If diet and lifestyle changes aren't enough on their own, UK pharmacists usually recommend trying laxatives in a particular sequence, starting with the gentlest option:

  • Bulk-forming laxatives (such as Fybogel or ispaghula husk) — these work like extra dietary fibre, absorbing water to make stools softer and bulkier. They're usually tried first and need to be taken with plenty of fluid; effects typically build over two to three days.
  • Osmotic laxatives (such as Movicol or Laxido) — these draw water into the bowel to soften stools further. They're often used if a bulk-forming laxative alone isn't enough, and are generally well tolerated for longer-term use.
  • Stimulant laxatives (such as senna) — these encourage the bowel muscles to contract and move stool along, usually working within 6–12 hours. They're typically used short-term for faster relief rather than as a long-term first choice.

Some people need a combination of these, particularly if constipation is related to a medicine they need to keep taking, such as an opioid painkiller. In that situation, a clinician or pharmacist will usually plan a regular laxative alongside the medicine rather than waiting for constipation to become a problem.

When to see a doctor

Most constipation settles with self-care within a couple of weeks. See a GP if:

  • Constipation lasts more than two to three weeks despite trying fibre, fluids and an appropriate laxative.
  • You notice blood in your stool or on the toilet paper.
  • You've lost weight without trying to.
  • You have severe or persistent abdominal pain, or ongoing bloating that doesn't settle.
  • Your bowel habit changes noticeably and stays changed, especially if you're over 50.
  • You're relying on laxatives regularly just to have a normal bowel movement.

These red flags matter because, while constipation itself is very common and usually straightforward, a persistent and unexplained change in bowel habit can occasionally be a sign of something that needs proper investigation. It's always worth getting checked rather than assuming it will pass — your clinician can advise on next steps based on your individual circumstances.

Managing chronic or recurring constipation

For some people, constipation isn't a one-off but a recurring pattern that keeps coming back. If that sounds familiar, a few things tend to help:

  • Keeping fibre and fluid intake consistent day to day, rather than only increasing them when symptoms flare.
  • Building a regular routine around toilet visits, particularly after breakfast.
  • Reviewing any regular medicines with a pharmacist or GP to see whether one might be contributing.
  • Using a maintenance laxative, such as a regular osmotic laxative, under guidance if lifestyle measures alone aren't holding things steady.

Chronic constipation that doesn't respond to standard self-care and pharmacy treatment sometimes needs further assessment to rule out an underlying cause and to put together a longer-term plan. A Farmeci consultation can help you work through what's likely contributing to recurring constipation and agree a sensible next step.