Frequent passing of foul smelling stools is a symptom of which disease?

Question

Accepted Answer

The correct option is 4:
Diarrhoea

Diarrhoea is defined by the frequent passage of loose or watery stools, but the characteristic of the stools being foul-smelling is a critical distinguishing factor, especially when the condition is caused by specific gastrointestinal issues. The unpleasant, foul odour often arises from the process of malabsorption, where the intestines fail to properly absorb nutrients, particularly dietary fat. This unabsorbed fat then passes into the large intestine, where it is broken down by gut bacteria, a condition known as steatorrhea. This bacterial breakdown produces volatile, odorous compounds, resulting in stools that are pale, bulky, greasy, and extremely foul-smelling. Furthermore, certain infectious causes of diarrhoea, whether bacterial (like *C. difficile*), parasitic (like Giardiasis), or viral, can also produce toxins or alter the microbial balance, leading to increased fermentation and the subsequent production of foul-smelling waste products. Therefore, frequent passing of stools that are foul-smelling strongly points to an underlying intestinal pathology that is expressed as diarrhoea, making this the most accurate answer.

The incorrect option is 1:
Diphtheria is an acute, infectious disease caused by the bacterium *Corynebacterium diphtheriae*, which is renowned for producing a powerful toxin. This disease is primarily a respiratory illness, affecting the throat and upper respiratory tract. Its most definitive clinical sign is the formation of a thick, tough, greyish membrane (pseudomembrane) in the throat, which can obstruct breathing and swallowing. The systemic effects of Diphtheria are due to the toxin damaging organs like the heart and nerves, leading to complications like myocarditis or paralysis. While any severe infection can cause general malaise, Diphtheria is not a disease whose main or characteristic symptom is frequent, foul-smelling stools, thus eliminating it as the correct option.

The incorrect option is 2:
Chickenpox is a highly contagious disease caused by the Varicella-zoster virus, and it is universally recognised for its distinct clinical presentation. The hallmark feature of Chickenpox is the widespread, itchy, vesicular rash that appears over the entire body, beginning with small, red bumps that turn into fluid-filled blisters before scabbing. Along with the rash, the patient typically experiences a fever, headache, and general malaise. This is a classic viral infection that affects the skin and is systemic. The gastrointestinal tract is not the primary site of pathology in Chickenpox, and the disease does not characteristically cause frequent, foul-smelling stools. The symptoms are predominantly dermatological and related to the acute systemic viral response.

The incorrect option is 3:
Rickets is a condition that affects bone development in children, resulting from a deficiency in Vitamin D, calcium, or phosphate, all of which are essential for bone mineralisation. The physical signs of Rickets are related to the skeletal system, including delayed growth, soft and tender bones, and prominent deformities such as bowed legs and an enlarged chest (rachitic rosary). Rickets is fundamentally a nutritional disorder affecting bone structure. While a severe underlying intestinal malabsorption syndrome (like Celiac disease) that *causes* the Vitamin D deficiency could simultaneously lead to foul-smelling stools (steatorrhea), Rickets itself is the resulting bone disease, not the direct cause of the gastrointestinal symptom. The description in the question refers to an ongoing functional intestinal issue, which is far more accurately described by the term diarrhoea.