Primary Lactose Intolerance (Usually Permanent)
The most common type is primary lactose intolerance. This develops naturally over time as lactase production decreases with age.
For most people, this type is permanent, but symptoms can be managed.
This is especially common in Asian, African, and Hispanic populations.
Secondary Lactose Intolerance (Often Temporary)
Secondary lactose intolerance occurs when the small intestine is damaged due to illness, infection, or conditions such as:
- Gastroenteritis (stomach flu)
- Celiac disease
- Inflammatory bowel disease
- Severe malnutrition
In these cases, lactose intolerance is often temporary. Once the underlying condition heals, lactase production may return, and dairy tolerance can improve.
Congenital Lactose Intolerance (Rare and Permanent)
This is a rare genetic condition where babies are born without the ability to produce lactase. It is permanent and lifelong.
