Many patients with chronic bloating, constipation, swallowing difficulty and abdominal discomfort are repeatedly told that their investigations are normal. According to GI motility specialist Dr Zubin Sharma, the answer may lie in understanding how the digestive tract functions, rather than simply how it looks.

For some patients, the most frustrating words in gastroenterology are: “Your tests are normal.”

They have persistent bloating. Severe constipation. Difficulty swallowing. Unexplained nausea. Reflux that does not seem to respond to conventional treatment. Sometimes, abdominal discomfort affects their work, sleep and social life.

Yet the endoscopy is normal.

The scan is normal.

Routine blood tests reveal no obvious explanation.

According to Dr Zubin Sharam , gastroenterologist specialising in neurogastroenterology and gastrointestinal motility, these patients represent one of the most important challenges in modern digestive medicine.

“A normal investigation is reassuring because it helps us exclude several serious diseases,” says Dr Zubin Sharma. “But it does not mean that every component of gastrointestinal function has been assessed.”

This distinction between structure and function is increasingly shaping the field of GI motility and neurogastroenterology.

An Endoscopy Shows Structure. The Gut Is Also a Moving Organ

An endoscopy is an extremely valuable investigation.

It allows a gastroenterologist to examine the lining of the oesophagus, stomach and part of the small intestine. Ulcers, inflammation, tumours and several other abnormalities may be identified.

But Dr Zubin Sharma points towards a simple physiological reality: the digestive tract has to move.

The oesophagus must generate coordinated contractions to transport food. The stomach has to relax when a meal enters, grind food and subsequently empty its contents. The intestine must move nutrients and digestive contents forward. The colon has its own complex motor patterns. Finally, the rectum and pelvic floor must coordinate appropriately for normal defecation.

“Imagine examining a car and finding that its body looks completely normal,” explains Dr Zubin Sharma. “That tells you something important, but it does not tell you whether the engine, transmission and electronics are functioning correctly.”

The same principle, he says, can sometimes apply to the gastrointestinal tract.

The Missing World of GI Motility

Gastrointestinal motility is the study of how the digestive tract moves and coordinates its functions.

Neurogastroenterology goes even deeper, examining the complex relationship between the gut, its nervous system and the brain.

For Dr Zubin Sharma, who has developed a specialised clinical focus in GI motility and neurogastroenterology, understanding these mechanisms is particularly important in patients with persistent symptoms and unrevealing conventional investigations.

Specialised physiological tests can provide a different type of information.

High-resolution oesophageal manometry can study pressure and coordination within the oesophagus. Anorectal manometry can evaluate rectal sensation and the function of muscles involved in defecation. Ambulatory reflux monitoring may help determine whether a patient’s symptoms actually correlate with reflux events. Transit studies can assess how contents move through the gastrointestinal tract.

“These tests should not be ordered indiscriminately,” cautions Dr Zubin Sharma. “The first step is understanding the patient’s symptom pattern. Physiology testing should answer a specific clinical question.”

Why Constipation Is Not One Disease

Constipation provides perhaps one of the clearest examples of this approach.

Two patients may both say, “I have severe constipation.” But physiologically, their problems may be completely different.

One patient may have delayed movement through the colon. Another may have relatively normal colonic movement but difficulty evacuating stool because the pelvic floor muscles are not coordinating correctly. A third patient may have altered rectal sensation. Some patients may have overlapping abnormalities.

According to Dr Zubin Sharma, repeatedly escalating laxatives without identifying the dominant mechanism can sometimes lead to years of incomplete treatment.

“If the primary problem is pelvic floor coordination, simply adding another laxative may not address the central issue,” says Dr Zubin Sharma. “That patient may require a completely different treatment strategy, including specialised biofeedback therapy.”

This is one reason Dr Zubin Sharma has consistently advocated for a more physiology-driven approach to difficult gastrointestinal symptoms.

“It Is Stress” Is Often an Incomplete Explanation

Patients with chronic gastrointestinal symptoms frequently encounter another explanation: stress.

There is genuine science behind the relationship between psychological stress and digestive symptoms. The brain and gastrointestinal tract communicate continuously through neural, hormonal and immune pathways. Stress can influence gastrointestinal motility and alter the perception of intestinal sensations.

But according to Dr Zubin Sharma, the gut-brain relationship is considerably more sophisticated than simply telling a patient to “stop taking stress”.

“The symptoms are real,” he explains. “The question is what mechanisms are generating and amplifying those symptoms.”

Modern neurogastroenterology studies disorders of gut-brain interaction, a group of conditions in which changes in gastrointestinal sensation, motility and brain-gut processing may contribute to symptoms.

For patients, understanding this mechanism can itself change the clinical conversation. The focus moves away from a false choice between “physical disease” and “psychological disease”. Instead, doctors can begin examining the biological communication between the digestive tract and nervous system.

Dr Zubin Sharma also shares patient-focused digestive health education through his YouTube channel, helping explain complex gut and motility concepts in accessible language.

Dr Zubin Sharma Believes Gastroenterology Must Look Beyond the Camera

Over the past several decades, endoscopy has transformed digestive healthcare. Advanced therapeutic endoscopy can now treat diseases that once required major surgery.

Dr Zubin Sharma himself has a clinical interest in advanced and third-space endoscopic procedures alongside GI motility and neurogastroenterology.

Yet he believes the success of endoscopy should not make gastroenterologists overly dependent on visible abnormalities.

“We have become exceptionally good at looking inside the gastrointestinal tract,” says Dr Zubin Sharma. “The next challenge is becoming equally sophisticated at understanding gastrointestinal function.”

This is particularly relevant for patients with unexplained bloating, refractory constipation, swallowing disorders, difficult reflux, suspected gastroparesis and complex gut-brain interaction disorders.

For these patients, the diagnostic journey may require a different question.

Not simply: What does the gut look like?

But: How is the gut actually functioning?

A New Direction for Digestive Medicine

Dr Zubin Sharma believes GI motility and neurogastroenterology will become increasingly important areas of gastroenterology in India.

As patient awareness grows, more people with chronic digestive symptoms are seeking explanations beyond repeated empirical treatment.

The answer will not always require a specialised motility investigation. Sometimes a careful clinical assessment may be enough.

But for selected patients, understanding gastrointestinal physiology can reveal abnormalities that structural investigations were never designed to detect.

“A normal endoscopy is good news,” says Dr Zubin Sharma. “But in the right patient, it may be the end of one diagnostic pathway and the beginning of another.”

For people who have spent years hearing that every investigation is normal, that distinction may finally provide a new direction.