What is the Difference Between Organic and Functional Constipation?

Constipation is generally divided into two main groups: organic and functional. The vast majority (more than 90%) of constipation seen in children is functional. In other words, it develops due to habits or behaviors without any organic abnormality in the intestines. In contrast, the more rarely seen organic constipation appears as a symptom of an underlying disease.

Functional constipation typically occurs in healthy children due to factors such as stool withholding habits, insufficient fiber intake, low fluid consumption, stress related to toilet training, or inactivity. The physical examinations of these children are generally normal, and their growth and development are not affected. Advanced tests are usually not needed to make a diagnosis, as it can be made through clinical history and a simple examination.

In contrast, organic constipation can be a sign of a serious condition. For example, congenital absence of intestinal nerve cells (Hirschsprung disease), spinal cord abnormalities (such as spina bifida - closure defects of the spine), hypothyroidism (underactivity of the thyroid gland and resulting thyroid hormone deficiency), metabolic diseases, or some neurological problems can cause organic constipation. In this case, constipation has been present since birth, the baby may not have passed their first meconium (first stool after birth) on time, defecation has never been regular, and growth and development are usually affected.

When doctors differentiate between functional and organic constipation, they pay attention to certain warning signs: constipation starting at a very early age (especially in infants younger than 6 months), abdominal distension, abnormal appearance of the anus, persistent difficulty with defecation, failure to gain weight, or known genetic diseases in the family suggest organic causes. If there is such suspicion, advanced tests (such as rectal biopsy, anal manometry, hormone tests) are performed.