Understanding Coeliac Disease: A Complete Patient Guide

What is Coeliac Disease?

Coeliac disease is an autoimmune condition where your small intestine’s delicate lining becomes inflamed and damaged when exposed to gluten. This protein is naturally present in wheat, barley, rye, and oats. When someone with coeliac disease consumes gluten, their immune system responds by attacking the intestinal lining, which prevents proper absorption of nutrients from food. This malabsorption can lead to various symptoms affecting the digestive system, alongside deficiencies in essential vitamins and minerals throughout the body.

The encouraging news is that coeliac disease responds very well to dietary management. By completely removing gluten from your diet (a gluten-free diet) and maintaining this restriction lifelong, your intestinal lining can heal, symptoms typically improve significantly, and your overall health should be restored.

How many people have Coeliac Disease?

Coeliac disease affects approximately one in every hundred Australians, making it far more common than many people realise. Despite these numbers, the condition remains significantly under-diagnosed in our community. Many people live with undiagnosed coeliac disease for years, attributing their symptoms to other causes or simply accepting them as normal. If you’re experiencing persistent digestive concerns or unexplained health issues, it’s worth discussing coeliac disease testing with your doctor.

Recognising the symptoms

Common presentations in adults

One of the challenges with coeliac disease is that it doesn’t present with a single distinctive pattern of symptoms. Some people experience numerous complaints, while others have very subtle or even no noticeable symptoms at all. Many people first discover they have coeliac disease during investigations for seemingly unrelated conditions.

Digestive symptoms often include diarrhoea, unexplained weight loss, nausea, excessive gas, and abdominal discomfort or bloating. Many patients also experience persistent tiredness and weakness, which usually stems from deficiencies in iron or folic acid. These deficiencies can progress to anaemia if left untreated.

Beyond digestive complaints, coeliac disease can reveal itself in unexpected ways. Some adults are diagnosed after investigations for bone thinning (osteoporosis), recurrent mouth ulcers, repeated miscarriages, or difficulty conceiving. These varied presentations highlight why doctors now consider testing for coeliac disease in a broader range of patients than in previous years.

How children are affected

In younger patients, coeliac disease typically manifests somewhat differently. Children often show poor weight gain, delayed physical growth and development, irritability, and reduced appetite alongside the digestive symptoms and anaemia common in adults. Parents might notice their child falling behind growth milestones or seeming unusually fussy about eating.

It’s important to remember that the symptoms described above are extremely common in the general population and are usually caused by conditions other than coeliac disease. However, given how frequently coeliac disease goes undiagnosed, it’s worth considering if you or your child experience persistent symptoms.

Family connections and genetic risk

Coeliac disease shows strong family patterns. If someone in your immediate family has been diagnosed with coeliac disease, your own risk increases substantially. Research indicates that roughly one in ten close family members of someone with coeliac disease will also have the condition, though they may not yet have been diagnosed or may not be experiencing symptoms.

If you have a parent, sibling, or child with coeliac disease, speak with your GP about screening, even if you feel completely well. Early detection allows you to prevent potential complications and maintain optimal health.

Getting tested for Coeliac Disease

When to see your doctor

If you suspect you might have coeliac disease based on your symptoms or family history, your general practitioner should be your first point of contact. They’ll take a thorough medical history, perform an examination, and determine whether further testing is appropriate. In some cases, you may be referred to a gastroenterologist for specialist assessment.

If someone in your family has recently been diagnosed with coeliac disease, it’s sensible to discuss screening with your doctor, even without symptoms. Blood tests can identify the condition before it causes significant problems.

The diagnostic process

Your doctor’s initial assessment, combined with specific blood tests, will indicate whether coeliac disease is likely. However, blood tests alone cannot definitively confirm the diagnosis. The only way to properly diagnose coeliac disease is through pathological examination of tissue samples (biopsies) taken from your small intestine.

Modern endoscopic procedures make obtaining these biopsies straightforward, safe, and painless. The procedure doesn’t require an overnight hospital stay, and you’ll be able to go home the same day. Your specialist will explain what to expect and answer any questions you may have.

A critical warning about diet before diagnosis

If coeliac disease is suspected, you must not start a gluten-free diet before being properly tested and diagnosed. Removing gluten from your diet will alter the appearance of your intestinal lining and can make accurate diagnosis impossible. Always wait until all necessary tests and biopsies have been completed before making any dietary changes. Your diagnosis should always be established with proper medical supervision.

Managing Coeliac Disease through diet

The gluten-free diet as treatment

Unlike many medical conditions, coeliac disease rarely requires medication. Instead, treatment centres on following a strict gluten-free diet, which you’ll need to maintain for life. This isn’t because the condition might worsen otherwise, but because your sensitivity to gluten never disappears. The gluten-free diet allows your intestine to heal and prevents ongoing damage.

Your doctor can provide basic information about the gluten-free diet, but we strongly recommend consulting with an experienced dietitian. The Dietitians Association of Australia maintains a directory of dietitians who specialise in coeliac disease and can provide comprehensive guidance on meal planning, food selection, and practical strategies for maintaining your diet long-term. Contact them through their website at www.daa.asn.au or by calling 1800 812 942.

The Coeliac Society of Australia, with branches throughout the country, offers invaluable support and resources. They provide detailed information about gluten-free products, recipes suitable for people with coeliac disease, and ongoing support for you and your family. Their expertise can make navigating your new diet much easier.

Communicating your diagnosis

It’s helpful to inform your family, friends, and colleagues about your coeliac disease diagnosis and explain how you manage it through diet. This openness makes social situations easier and helps others understand your dietary requirements. Additionally, let your pharmacist know about your condition, as some prescription and over-the-counter medications contain gluten as an inactive ingredient.

Understanding gluten-free foods

Gluten-free alternatives to common foods are now widely available in supermarkets and health food stores. You’ll find gluten-free breads, biscuits, pasta, cereals, and many other products that make following your diet much more convenient than in years past. Learning to read food labels becomes an essential skill, and your dietitian will teach you what to look for.

Safe flour alternatives include rice, potato, lentil, and soy flours, along with pure maize cornflour, cornmeal, arrowroot, buckwheat, sorghum, millet, sago, tapioca, and quinoa. Many traditional grain products have excellent gluten-free substitutes available.

Fresh fruits and vegetables, unprocessed meats, fish and poultry, plain dairy products, legumes, nuts, and seeds are naturally gluten-free and form the foundation of a healthy diet. The challenge often lies in avoiding hidden gluten in processed foods, sauces, and mixed dishes.

For takeaway meals, steamed rice, grilled fish or chicken without coating, steak, and simple Asian dishes prepared without soy sauce or thickeners are generally safe options. Many restaurants now understand gluten-free requirements and can accommodate your needs if you explain your condition.

Beverages require attention too. While water, tea, coffee, most soft drinks, fruit juices, wine, spirits, and cider are gluten-free, beer, ale, stout, and lager contain gluten. Gluten-free beer is available as an alternative.

Ongoing medical care and monitoring

Follow-up testing

Standard practice includes repeating your intestinal biopsy approximately twelve months after diagnosis to confirm that your intestine is healing properly on the gluten-free diet. Your medical team will also recommend regular blood tests to monitor various aspects of your health, including a full blood count, iron levels, vitamin B12, folic acid, thyroid function, calcium, phosphate, vitamin D, zinc, and liver function.

A bone mineral density test (DEXA scan) should be performed when you’re first diagnosed and repeated as your doctor advises. This helps identify any bone thinning that may have developed and monitors your bone health over time.

Why strict adherence matters

Failing to maintain a strict gluten-free diet carries serious long-term health risks. People with coeliac disease who continue consuming gluten face increased risk of bowel lymphoma (a type of cancer), progressive osteoporosis, fertility problems, and chronic ill health. However, when you follow a gluten-free diet consistently, your risk of these complications returns to normal population levels.

You’ll need ongoing monitoring through your general practitioner, gastroenterologist, and dietitian to ensure your condition remains well-controlled and your health stays optimal.

Finding support and further information

Living with coeliac disease becomes much easier with proper support. Coeliac Australia, the national organisation, along with its state and territory branches, provides comprehensive resources for people with coeliac disease and their families.

Contact Coeliac Australia on 1300 GLUTEN (1300 458 836) or visit their website at www.coeliac.org.au. State branches offer localised support and information specific to your area.

Your healthcare team, including your GP, gastroenterologist, and dietitian, remain your primary sources for medical advice and personalised guidance. Don’t hesitate to reach out to them with questions or concerns as you navigate life with coeliac disease.

Related procedures include reflux, gastroscopy (upper endoscopy), oesophageal manometry, 24-hour pH monitoring, endoscopic dilation, and anti-reflux surgery (fundoplication).

This information has been adapted from patient education resources developed by the Gastroenterological Society of Australia (GESA) and Digestive Health Foundation.

Last reviewed: 18 December 2025