Constipation

Constipation describes bowel movements that are less frequent, harder, more difficult, or more painful than usual. It may involve fewer than three bowel movements a week, hard or dry stool, excessive straining, prolonged time on the toilet, or a feeling that the bowel has not emptied completely.

Normal bowel habits vary considerably. Some people normally have several bowel movements a day, while others have one every few days. Constipation is therefore not defined only by frequency. A noticeable change from the person’s usual pattern, difficulty passing stool, or persistent discomfort may be equally important.

Constipation can be temporary and related to changes in diet, travel, reduced activity, dehydration, stress, illness, or medication. Persistent or recurring constipation may be associated with irritable bowel syndrome, slow movement through the colon, pelvic floor dysfunction, thyroid disease, diabetes, neurological conditions, or another medical problem.

How constipation may feel

Constipation may develop gradually or begin after a change in routine, diet, medication, or health. Some people mainly notice that bowel movements are less frequent. Others have daily bowel movements but still struggle with hard stool, straining, pain, or incomplete emptying.

Common features include:

• fewer bowel movements than usual
• hard, dry, lumpy, or pellet-like stool
• straining during bowel movements
• pain or burning while passing stool
• a feeling that stool remains in the rectum
• needing a long time to complete a bowel movement
• bloating, abdominal pressure, or cramping
• reduced appetite or early fullness
• small amounts of liquid stool leaking around impacted stool

A person can be constipated even when bowel movements occur regularly if evacuation is consistently difficult or incomplete.

Common causes of constipation

Diet, hydration, and daily routine

A diet low in fiber may produce smaller, harder stools that move more slowly through the bowel. Inadequate fluid intake can contribute to dry stool, particularly when combined with increased fiber, fever, vomiting, hot weather, or increased physical activity.

Reduced physical activity, prolonged sitting, travel, shift work, changes in meal timing, and regularly ignoring the urge to use the toilet can also contribute. The bowel may become less responsive when the urge to pass stool is repeatedly postponed.

Medication and supplements

Constipation can be caused or worsened by medications. Possible examples include opioid pain medicines, iron supplements, some antacids, certain antidepressants, anticholinergic medicines, some blood pressure treatments, and medications used for neurological or psychiatric conditions.

Prescribed medication should not be stopped without medical advice. A doctor or pharmacist may recommend changing the dose, timing, preparation, or treatment when medication-related constipation is suspected.

Irritable bowel syndrome with constipation

Irritable bowel syndrome with constipation may cause recurring abdominal pain, bloating, difficult bowel movements, hard stool, and a feeling of incomplete emptying. Symptoms may fluctuate and can be influenced by meals, stress, sleep, menstrual changes, and other factors.

Visible blood in the stool, persistent fever, anemia, or progressive unexplained weight loss are not typical features of uncomplicated irritable bowel syndrome and require assessment for another cause.

Slow movement through the colon

In some people, stool moves unusually slowly through the large intestine. More water is absorbed from the stool during the prolonged transit, making it harder and more difficult to pass.

Slow-transit constipation may cause very infrequent bowel movements, reduced natural urge, bloating, abdominal discomfort, and limited response to simple lifestyle measures.

Pelvic floor and evacuation problems

Passing stool requires coordination between the abdominal muscles, rectum, anal sphincter, and pelvic floor. If these muscles do not relax and coordinate appropriately, stool may reach the rectum but remain difficult to pass.

People may experience prolonged straining, a sensation of blockage, incomplete emptying, or a need to change position or use manual pressure to assist evacuation. Specialist testing may be required when an evacuation disorder is suspected.

Hormonal and metabolic causes

An underactive thyroid can slow digestive movement and may cause constipation together with fatigue, cold intolerance, dry skin, weight gain, or slower thinking.

Constipation may also occur with diabetes, abnormal calcium levels, electrolyte disturbances, dehydration, pregnancy, or hormonal changes. Laboratory testing is selected according to the complete symptom pattern rather than constipation alone.

Neurological and other medical conditions

Conditions affecting nerves or muscles may interfere with bowel movement or pelvic floor coordination. Constipation may occur with certain neurological disorders, spinal conditions, reduced mobility, or after abdominal and pelvic surgery.

Less commonly, a narrowing, mass, severe inflammation, or other structural problem in the bowel may interfere with stool passage. A new and persistent change in bowel habits deserves particular attention when accompanied by bleeding, anemia, weight loss, or increasing pain.

Symptoms that may occur with constipation

Associated symptoms can help determine the likely cause and the urgency of assessment. Relevant symptoms include:

• bloating, pressure, or abdominal pain
• painful bowel movements or anal discomfort
• blood on toilet paper or on the surface of the stool
• nausea, reduced appetite, or early fullness
• alternating constipation and diarrhea
• fatigue, cold intolerance, or weight changes
• increased thirst, frequent urination, or changes in blood glucose
• pelvic pressure, urinary symptoms, or difficulty relaxing during evacuation
• unexplained weight loss, fever, or night sweats

Small amounts of bright red blood may occur with hemorrhoids or an anal fissure after passing hard stool, but rectal bleeding should not automatically be attributed to constipation without appropriate assessment.

Fecal impaction

Long-lasting constipation can sometimes lead to fecal impaction, in which a large mass of hard stool becomes stuck in the rectum or colon. Liquid stool may leak around the blockage and appear similar to diarrhea.

Possible signs include:

• inability to pass a normal bowel movement
• marked rectal pressure or pain
• abdominal swelling or cramping
• small amounts of watery stool or stool leakage
• nausea, reduced appetite, or worsening general condition

Fecal impaction may require medical treatment and should not be managed by repeatedly taking additional laxatives without guidance.

When constipation needs medical attention

Arrange a medical assessment when constipation is persistent, repeatedly returns, represents a significant change from the usual bowel pattern, or does not improve with reasonable dietary and lifestyle measures.

Medical advice is particularly important when constipation is accompanied by:

• blood in the stool or rectal bleeding
• black stool
• persistent or increasing abdominal pain
• unintentional weight loss
• anemia or marked fatigue
• fever or vomiting
• a new change in stool shape or bowel habits
• symptoms that regularly wake the person at night
• a family history of colorectal cancer or inflammatory bowel disease

Seek urgent medical care if constipation occurs with severe abdominal pain, repeated vomiting, a markedly swollen or rigid abdomen, inability to pass stool or gas, fainting, confusion, heavy bleeding, or rapid deterioration in general condition. These symptoms may indicate bowel obstruction or another urgent condition.

How constipation is usually diagnosed

Medical and bowel history

The assessment usually begins with the person’s normal bowel pattern, when the change started, stool consistency, straining, pain, incomplete emptying, diet, fluid intake, physical activity, medication, previous surgery, pregnancy, and existing medical conditions.

A short bowel diary may record the frequency and appearance of stools, time spent on the toilet, pain, bloating, medication, meals, and laxative use. This can help distinguish occasional constipation from a persistent pattern.

Clinical examination

A doctor may assess hydration, blood pressure, weight, abdominal tenderness, swelling, bowel sounds, or palpable stool. A rectal examination may sometimes be needed to assess impacted stool, bleeding, anal problems, muscle tone, or coordination.

Laboratory testing

Laboratory testing is not required for every short episode of constipation. When symptoms are persistent or associated with other findings, testing may include a complete blood count, thyroid function, blood glucose, electrolytes, calcium, kidney function, inflammatory markers, or celiac disease testing.

A thyroid panel may be relevant when constipation occurs with fatigue, cold intolerance, weight gain, or dry skin. Glucose testing may be appropriate when symptoms include increased thirst, frequent urination, or other diabetes risk factors. The choice of tests should be targeted to the overall clinical picture.

Endoscopy and imaging

Colonoscopy or other bowel imaging may be considered when constipation is accompanied by bleeding, anemia, unexplained weight loss, a significant new change in bowel habits, abnormal examination findings, or other warning signs.

Imaging may also be required when bowel obstruction, severe stool accumulation, or another structural condition is suspected.

Specialist bowel function testing

People with long-lasting constipation that does not respond to initial treatment may need testing of stool movement through the colon or function of the rectum and pelvic floor. These tests can include colonic transit studies, anorectal manometry, balloon expulsion testing, or defecography.

Such tests help distinguish slow-transit constipation from a problem with evacuation and pelvic floor coordination.

What the next step may involve

The next step depends on the cause, duration, and severity of constipation. Initial measures may include gradually increasing dietary fiber, maintaining adequate fluid intake, regular physical activity, and allowing enough uninterrupted time for bowel movements.

A regular toilet routine, especially after meals when the bowel is naturally more active, may help. The urge to pass stool should not be repeatedly ignored.

A sudden large increase in fiber can worsen bloating, gas, or pain. Fiber should generally be increased gradually and may not be suitable as the only treatment for severe slow-transit constipation, fecal impaction, or certain evacuation disorders.

Laxatives may be appropriate for some people, but the type and duration should reflect the cause and medical history. Repeated or prolonged use without assessment may be ineffective, mask another condition, or cause fluid and electrolyte problems.

Pelvic floor biofeedback or physiotherapy may help when constipation is caused by poor coordination during evacuation. Treatment of an underlying thyroid disorder, diabetes, medication effect, or another medical condition may also improve bowel function.

What to prepare before a medical appointment

Before an appointment or ZagrebMed inquiry, prepare information about:

• the usual bowel pattern and what has changed
• how often bowel movements occur
• stool appearance and consistency
• straining, pain, or a feeling of incomplete emptying
• bloating, vomiting, bleeding, or weight changes
• daily fluid, fiber, and physical activity
• medication, iron supplements, and laxative use
• pregnancy, previous abdominal surgery, or neurological conditions
• thyroid, glucose, calcium, or other previous laboratory results
• previous colonoscopy, imaging, or gastroenterology reports

If constipation is persistent, worsening, or associated with other digestive or general symptoms, you can send ZagrebMed a description of the bowel pattern and any existing medical documentation. ZagrebMed can help connect the symptom with appropriate laboratory testing, digestive diagnostics, or specialist evaluation in Zagreb.