Creamy sauces, delicious cheese platters, spoonfuls of tangy yogurt – and let’s not forget the hot, milky coffee that gets you moving each morning.
Many Australians eat dairy products, which provide key nutrients such as calcium, protein, iodine, riboflavin, zinc and vitamins A, B12 and D.
Unfortunately, though, not everyone is able to enjoy dairy, whether due to a true dairy allergy or lactose intolerance – and yes, there is a difference between those two things.
Dairy allergy vs lactose intolerance
While the terms ‘dairy allergy’ and ‘lactose intolerance’ are often used interchangeably, they do refer to different conditions.
A dairy allergy involves an immune system response, where the body mistakenly identifies dairy proteins, such as casein or whey, as harmful. This triggers an allergic reaction, which can range from mild symptoms like hives and swelling to severe responses like anaphylaxis.
In contrast, lactose intolerance is a digestive issue caused by a deficiency in lactase, the enzyme responsible for breaking down lactose (the natural sugar found in milk). Without enough lactase, undigested lactose moves into the colon, where it ferments, leading to symptoms like bloating, gas, and diarrhoea. Unlike dairy allergy, lactose intolerance does not involve the immune system and is generally less severe, though it can still affect your daily life.
| Dairy allergy | Lactose intolerance | ||
| What is it? | Allergic reaction to casein or whey proteins in milk products. | Absence of an enzyme (lactase) that helps break down a natural sugar (lactose) found in milk. | |
| Is the immune system involved? | Yes. | No. | |
| Symptoms | Can affect skin, breathing and digestion. | Digestive symptoms only – e.g. bloating, gas, diarrhoea. | |
| IgE-mediated – mild to severe symptoms occur immediately after digestion. | IgG-mediated – occur up to 48 hours after consumption. | ||
| Management | Avoid all dairy products, including hidden sources. | Choose lactose-free dairy products. | |
Dairy allergy symptoms
Dairy allergies can present with a wide range of symptoms, affecting the skin, respiratory system, and digestive tract.
Common symptoms include:
- Skin reactions, such as hives, redness, and itching
- Swelling of the lips, tongue, or throat
- Breathing difficulties, including wheezing and shortness of breath
- Abdominal pain, nausea, vomiting, and diarrhoea
- Anaphylaxis – a severe, potentially life-threatening reaction requiring immediate medical attention.
Types of dairy allergies
Dairy allergies typically stem from an immune response to one or more proteins found in milk. The two main types of dairy allergies are:
- Casein allergy: Casein is a protein found in the solid part of milk that curdles when milk turns sour. It is a common trigger for dairy allergies and can be found in most dairy products, including cheese, yoghurt, and milk powder.
- Whey allergy: Whey is the liquid portion of milk that remains after curdling. It is often found in dairy-based protein powders and many processed foods.
Reactions to dairy proteins can vary widely, with some individuals experiencing severe
symptoms even from trace amounts of dairy. Children are more likely to outgrow dairy allergies, while adults may experience persistent symptoms.
Dairy allergies can involve two different types of immune responses:
- IgE-mediated dairy allergies are immediate hypersensitivity reactions that can cause rapid symptoms like hives, swelling, and anaphylaxis shortly after dairy consumption.
- IgG-mediated reactions are typically delayed, leading to more subtle and slower-developing symptoms such as digestive discomfort, skin issues, and fatigue. That delay can make it harder to identify the fact that dairy is the problem – and that’s where ImuPro can help.
Dairy allergy test options
Standard allergy tests arranged by your doctor can usually identify IgE-mediated allergies to dairy products.
But what do you do if you suspect a delayed dairy allergy?
You turn to ImuPro. Our tests cover a number of dairy products, including
- Camel’s milk
- Goat’s milk and cheese
- Haloumi
- Kefir
- Milk (cooked)
- Milk (cow)
- Ricotta
- Rennet cheese (cow)
- Sheep’s milk and cheese
- Sour milk products (cow).
Our IgG tests measure your blood serum for the presence of IgG antibodies in response to certain foods. Armed with that knowledge, you can adjust your diet to ease your symptoms and improve your quality of life.
Disclaimer
All information is general and not intended as a substitute for professional advice.
References
- Eat for Health, Milk, yogurt cheese and their alternatives, https://www.eatforhealth.gov.au/food-essentials/five-food-groups/milk-yoghurt-cheese-andor-their-alternatives-mostly-reduced-fat, [Accessed 16 May 2025]
- Sydney Children’s Hospitals Network, Dairy allergy factsheet, https://www.schn.health.nsw.gov.au/dairy-allergy-factsheet#, [Accessed 16 May 2025]
- Healthdirect, Lactose intolerance, https://www.healthdirect.gov.au/lactose-intolerance, [Accessed 16 May 2025]
- Healthdirect, Allergic reactions to cow’s milk, https://www.healthdirect.gov.au/allergic-reactions-to-cows-milk, [Accessed 16 May 2025]
- Walsh J, Meyer R, Shah N, Quekett J, Fox AT. Differentiating milk allergy (IgE and non-IgE mediated) from lactose intolerance: understanding the underlying mechanisms and presentations. Br J Gen Pract. 2016 Aug;66(649):e609-11. doi: 10.3399/bjgp16X686521. PMID: 27481986; PMCID: PMC4979917. https://pmc.ncbi.nlm.nih.gov/articles/PMC4979917/, [Accessed 16 May 2025]