Spasticity and atonia - constipation does not have a single name

Spastic constipation arises from chronic, excessive contraction of the smooth muscle within the colon, significantly impeding the physiological transit of fecal matter through the gastrointestinal tract. This heightened neuromuscular excitability effectively suppresses normal peristaltic activity, resulting in the stagnation of intestinal contents. The most frequent pathological cause is inflammatory involvement of the colonic mucosa, though dysfunction of abdominal organs—whether primary or secondary to inflammatory or mechanical processes—may also contribute. Additional precipitating factors include irritative stimuli such as the accumulation of hardened fecal masses, parasitic infestations (e.g., ascariasis), or the presence of gallstones irritating visceral nerves. Behavioral components further exacerbate the condition: the habitual suppression of the defecation reflex can lead to so-called functional constipation, compounded by psychological stress, mood disorders (depression, generalized anxiety), or dissociative symptoms. Clinically, the condition manifests primarily as colicky abdominal pain, distension, and a persistent sensation of incomplete evacuation despite vigorous straining. A hallmark feature is the passage of small, hard stool fragments, occasionally mixed with mucus, which may alternate with episodes of diarrhea—a phenomenon termed paradoxical diarrhea. Systemic manifestations include polydipsia (excessive thirst) and transient facial flushing, indicative of autonomic nervous system activation.

Atonic constipation is defined by a marked reduction in intestinal motility, stemming from diminished muscular tone in the bowel wall alongside excessive reabsorption of fluid from fecal matter within the colon. This pathological process results in the formation of dry, compacted, and difficult-to-expel stool. The condition’s etiology is multifactorial, encompassing sedentary behavior, chronic suppression of the natural defecation reflex, systemic disease sequelae, and neurological impairments. Clinical presentation extends beyond impaired bowel evacuation to include associated symptoms such as persistent fatigue, anorexia, pallor, colicky abdominal pain, and excessive flatulence. Improper management—particularly the overuse of laxatives or deliberate inhibition of the defecation urge—may exacerbate the condition, leading to chronicity and secondary complications like intestinal dysbiosis or mucosal inflammation. The cornerstone of treatment involves comprehensive lifestyle modifications, including adoption of a high-fiber diet, consistent physical exercise, and establishment of regular bowel habits. Refractory cases necessitate specialist evaluation to devise a tailored therapeutic regimen.