How Diseases Are Defined
Diseases are often defined by their symptoms. If your sinuses become congested, your nose runs, and you begin coughing and sneezing for a week or two, you are usually said to have a cold. If those symptoms are accompanied by fever, malaise, red and tearing eyes (conjunctivitis), and are followed by the appearance of Koplik’s spots in the mouth, the diagnosis is measles.
Symptoms vs. Underlying Mechanisms
Defining disease by symptoms often works well enough. In some situations, however—particularly with vague or chronic health problems—it may be more useful to think in terms of underlying mechanisms rather than symptom labels alone.
Irritable Bowel Syndrome: A Case in Point
Irritable bowel syndrome (IBS) is a good example. The diagnosis is typically given when a patient experiences gas, bloating, diarrhea, and abdominal pain, but no other clearly identifiable disease is present.
When researchers study IBS, they find that different interventions help different subsets of patients—but rarely all of them. Studies published in the Journal of the American Medical Association (August 18, 2004) and the American Journal of Gastroenterology (December 2000) identified a link between small intestinal bacterial overgrowth and IBS in some patients. Reducing bacterial overgrowth improved symptoms in many participants, but not in all.
Why Treatments Work for Some—But Not All
Other studies have explored food sensitivities or elimination diets, again finding that some patients improve while others do not. Similar patterns appear across IBS research: certain approaches help some individuals, but no single intervention works universally.
This suggests that IBS is not a single disease with a single cause, but rather a collection of symptoms that may arise from different underlying mechanisms in different people.
A similar pattern is seen in other chronic and complex conditions—such as multiple sclerosis, ADHD, autism spectrum disorders, fibromyalgia, and related syndromes—that often defy simple explanations. Some individuals experience meaningful improvement with certain natural or lifestyle-based approaches, while others do not. Even well-known dietary interventions, such as the Specific Carbohydrate Diet developed by Elaine Gottschall, help some people with Crohn’s disease but not all.
This variability highlights one potential strength of natural healthcare approaches: an emphasis on understanding and addressing the individual patient rather than applying a single solution to everyone with the same diagnosis.
