13 Surprising Causes of Constipation
A common problem
What causes constipation? Well, the obvious culprits include a low fiber diet, repeatedly ignoring the urge to go, not drinking enough water, or a lack of exercise.
But constipation also has other, less-well-known causes, including certain medications and supplements, as well as potentially serious medical conditions.
What’s causing your gut trouble? Here are 13 possible causes of constipation you may not have considered.
Hypothyroidism, or an underactive thyroid gland, slows the body’s metabolic processes—even the gut.
Not everyone with an underactive thyroid has constipation, nor do all cases of constipation mean that the butterfly-shaped gland in your neck is underperforming.
Still, "when I see a young person who’s constipated more than normal and really complaining, I do tend to get a thyroid level," says Carla H. Ginsburg, MD, assistant professor of medicine at Harvard Medical School in Boston.
"A lot of receptors for the narcotic class of drugs are in the digestive tract, so it tends to bring everything to a halt," says Thomas Park, MD, a gastroenterologist with the University of Rochester Medical Center Park in New York. "In general, it’s a good idea for everyone who’s placed on one of these drugs to also place them on a gentle laxative like a stool softener."
Some studies (but not all) have suggested that there might be a higher risk of constipation for people who are chronic users of pain relievers like aspirin and ibuprofen.
In one 2005 study, people with chronic constipation or irritable bowel syndrome were more likely than people without those problems to say that chocolate caused constipation (as did bananas and black tea).
Eliminate or cut back on chocolate if you think it could be causing your constipation.
"I would tell a patient to stop taking the iron [or calcium] unless they really need it and, if they do need it, I would put them on a stool softener to counteract that," says Dr. Ginsburg, who is a spokesperson for the American Gastroenterological Association.
If used for long periods of time, stimulant laxatives can lead to dependence, meaning your body simply won’t function properly without them.
Stimulant laxatives include Dulcolax, Ex-Lax, Senna, and others.
Don’t take any medicationincluding laxativesfor longer than instructed by either the product’s label or your doctor.
Too much dairy
"If you’re going to have cheeses and red meat and eggs, mix in some salads or other foods that have fiber," Dr. Park advises. And avoid fast foods and processed foods, which are generally low in fiber.
However, constipation is more of a problem with older tricyclic antidepressants such as Elavil (amitriptyline), says Dr. Park. Why any of these drugs have this effect isn’t clear, though.
If you’re taking an antidepressant and have this side effect, think about using a gentle stool softener.
Like hypothyroidism, depression causes a general slowdown of the body’s normal processes, which can also affect the bowel.
People with irritable bowel syndrome, which can be closely linked to depression, are also prone to constipation, Dr. Park says.
Fortunately, the drugstore aisles are crammed with options, so if one medication is a problem you can try something else.
You can also cut down on your risk of heartburn by not overstuffing at meals. And consuming fewer fatty foods and more fiber will help prevent both problems.
Blood pressure and allergy meds
Diuretics, for instance, lower blood pressure by increasing urine output, which flushes water from your system. However, water is needed to keep stools soft and get them out of the body.
Antihistamines used to treat allergy symptoms can be a problem too.
Inflammatory bowel disease
Chronic diarrhea is a common symptom of both. However constipation can be a problem too.
In ulcerative colitis, constipation can be a sign of inflammation in the rectum and in Crohn's disease it can be a sign of an obstruction in the small intestine. However if you have constipation alone, without other symptoms, it's unlikely to be due to IBD.
Also, "there may be some perineal soreness right after the delivery, so the fear of causing more discomfort may be an important factor in the constipation," says Dr. Park.
Although stretch injuries during childbirth can sometimes cause nerve damage that leads to constipation, this is less common.
Diabetes and neurological conditions
Most people with advanced diabetes know they have it. Still, it’s reasonable to do a blood sugar test on someone who is regularly constipated, says Dr. Ginsburg.
Neurological conditions such as multiple sclerosis or Parkinson’s disease can cause constipation. Usually, though, "this goes with another symptom such as trouble urinating, double vision, or a gait problem," Dr. Ginsburg says.