Can Lactose Intolerance Develop Later in Life?
Medically reviewed by Linda Girgis | MD, Girgis Family Medicine on August 20th, 2026.
Yes, lactose intolerance can develop later in life and affects up to 65% of adults worldwide. Primary lactose intolerance occurs when lactase enzyme production naturally decreases after weaning, typically between ages 2-5, though symptoms may not appear until adulthood. Secondary lactose intolerance can develop at any age following illness, injury, or surgery affecting the small intestine. Certain ethnic groups have higher rates, with 90% of East Asians and 80% of African Americans experiencing some degree of lactose intolerance. Symptoms include bloating, gas, diarrhea, and abdominal cramps within 30 minutes to 2 hours after consuming dairy products.
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