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13 Surprising Causes of Constipation

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. Here are 13 possible causes of constipation you may not have considered.

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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.

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