Lactase is produced in high quantities during the first two years of life, after which there is a steady decline in its production. Hence, many may develop this condition and not realize it.
याला लॅक्टोज अपचन म्हणतात; यामुळे वर सांगितलेले काही किंवा सर्वच लक्षणे दिसू लागतात.