Bloating and Indigestion

Bloating is a feeling, while distension is visible abdominal enlargement. Indigestion describes upper abdominal discomfort, and heartburn is usually a reflux symptom. Timing and associated features matter more than one assumed mechanism.

Four related terms describe different experiences Bloating is the feeling of abdominal fullness, pressure or swelling. Abdominal distension is a visible or measurable increase in abdominal size. The two can occur together or separately. A person may feel very bloated without marked distension, while another person may develop visible swelling. Indigestion, also called dyspepsia, describes upper abdominal pain or burning, uncomfortable fullness after eating or feeling full unusually quickly. Heartburn is a burning feeling behind the breastbone, usually linked with reflux. These symptoms often overlap, but they are not interchangeable. None identifies the cause by itself. Bloating is not simply trapped gas Swallowed air and gas produced during fermentation can contribute to bloating. Constipation can also increase fullness and abdominal pressure. However, symptom severity does not always match the amount of gas present. The gut may become more sensitive to normal stretching or process movement differently. The diaphragm and abdominal wall muscles can also respond in a way that increases visible distension. This does not mean the symptoms are imagined. Irritable bowel syndrome, constipation and coeliac disease can cause bloating. Menstrual changes, pregnancy, medicines and reduced movement can also contribute. Less common causes include ascites, which means fluid in the abdomen, bowel obstruction and ovarian disease. The complete pattern determines which possibilities need assessment. Indigestion has several possible explanations Functional dyspepsia is a disorder of gut brain interaction. It causes upper abdominal symptoms when no structural disease adequately explains them after appropriate assessment. Possible mechanisms include altered stomach sensitivity, reduced relaxation after a meal and changes in movement through the upper digestive tract. Delayed stomach emptying is one possibility rather than the usual explanation for every case. Gastro oesophageal reflux occurs when stomach contents move into the oesophagus. Heartburn and regurgitation can result, but reflux does not explain every episode of upper abdominal discomfort. Peptic ulcers, Helicobacter pylori infection and medicines such as anti inflammatory painkillers can also cause dyspepsia. Gallbladder, pancreatic and cardiac conditions can sometimes resemble indigestion. Food patterns provide context rather than a diagnosis Large meals, alcohol, smoking and lying down soon after eating can worsen reflux symptoms in some people. Individual food triggers vary considerably. Spicy or fatty food may provoke symptoms without proving acid reflux or delayed stomach emptying. A food related pattern does not locate the problem by itself. Fermentable carbohydrates can increase gas production in some people. Broad food restriction can cause nutritional problems and should not be started without appropriate advice. A symptom diary can record meals, bowel habit, medicines, menstrual timing and associated symptoms. It helps identify patterns but does not diagnose the cause. The surrounding symptoms change the assessment Clinicians ask whether bloating is occasional, persistent or frequent and whether the abdomen becomes visibly distended. They ask about pain, bowel habit, vomiting and weight change. Upper abdominal burning, early satiety, nausea and regurgitation help describe dyspepsia. Difficulty swallowing is a separate warning symptom and requires urgent assessment. Persistent bloating with early satiety, pelvic or abdominal pain, or urinary urgency can prompt ovarian assessment. NICE places particular emphasis on frequent symptoms, especially in people aged fifty or over with female reproductive organs. Chest pressure, tightness or burning can resemble indigestion. Sweating, breathlessness, nausea or spreading discomfort raises concern about a heart problem rather than simple reflux. Medicines, pregnancy, previous surgery, alcohol use and health problems in the family also affect the assessment. No single associated symptom provides a diagnosis. Examination provides several clues A clinician checks weight, pulse, blood pressure, temperature and general appearance. They examine the abdomen for tenderness, distension, fluid, enlarged organs or a mass. They may look for pallor, jaundice or signs of dehydration. A pelvic examination may be considered when the symptom pattern requires it. A normal examination does not exclude every important cause. Symptoms can be intermittent, and some conditions produce few early physical signs. Tests answer different questions A breath test or stool antigen test can detect current Helicobacter pylori infection. A positive result does not prove that the infection explains every symptom. Proton pump inhibitors can reduce test accuracy. NICE advises a two week washout before breath or stool testing when a clinician confirms that stopping is safe. Testing is usually delayed until four weeks after antibiotics because they can also reduce accuracy. Do not stop prescribed medicines without professional advice. Blood tests may assess anaemia, inflammation, coeliac disease, liver patterns or other suspected causes. Each result requires interpretation with the clinical pattern. CA125 is a blood marker used in the ovarian cancer assessment pathway. It can rise for non cancer reasons and does not diagnose ovarian cancer by itself. An ultrasound can assess pelvic organs, gallstones, fluid or another structural question. Its usefulness depends on the suspected cause and the area being examined. An upper gastrointestinal endoscopy uses a flexible camera to examine the oesophagus, stomach and first part of the small intestine. It can take biopsies but cannot identify every functional cause. A normal endoscopy does not mean the symptoms are imagined. Functional dyspepsia can remain a valid diagnosis after appropriate assessment excludes important structural disease. Investigation follows current risk patterns Most short lived bloating or uncomplicated indigestion does not need immediate endoscopy. Initial management may include self care, medicine review, acid suppression or Helicobacter pylori testing. Difficulty swallowing requires an urgent suspected cancer pathway referral. This recommendation applies without an age threshold. NICE also recommends urgent referral for people aged fifty five or over with weight loss plus dyspepsia, reflux or upper abdominal pain. These features raise concern without confirming cancer. People aged fifty five or over with treatment resistant dyspepsia or reflux may discuss non urgent endoscopy. Age alone does not make every new episode an urgent cancer referral. What may happen after assessment A pharmacist or clinician may suggest smaller meals, avoiding individual triggers and not lying down soon after eating. Constipation treatment may reduce bloating when it is contributing. A proton pump inhibitor may be used for a limited trial in dyspepsia or reflux. Helicobacter pylori treatment is offered only after an appropriate positive test. Persistent symptoms may lead to blood tests, endoscopy, ultrasound or specialist review. The choice depends on the combined pattern rather than the symptom label alone. When to get help Call 999 or go to A&E for a swollen abdomen with sudden severe pain. Do the same if bloating occurs with vomiting blood, coffee ground vomit or severe breathing difficulty. Call 999 for chest discomfort that does not go away, feels tight or heavy, spreads, or occurs with sweating, nausea or breathlessness. Do not drive yourself. Ask for an urgent GP appointment or contact NHS 111 for bloating with vomiting, fever, significant pain, diarrhoea or constipation. Seek urgent help if you cannot pass urine, stool or wind. Request urgent assessment for difficulty swallowing, repeated vomiting, black sticky stool, unexplained weight loss, iron deficiency anaemia or a new abdominal lump. Arrange a GP review for bloating that persists, recurs frequently or affects daily life. Review is especially important with early satiety, pelvic pain or urinary urgency. This lesson explains how clinicians assess bloating and indigestion. It cannot identify the cause of an individual symptom or replace urgent medical care.

Bloating is not simply a gas measurement, and indigestion is not automatically acid reflux. Clinicians combine the symptom pattern, examination and targeted tests before identifying a cause.