What should I do if I am lactose intolerant?

Written by Tong Peng

Pediatrics

Updated on March 27, 2025

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If lactose intolerance occurs, it is essential to adjust the diet and medication. Lactose intolerance can cause an increase in the frequency of bowel movements and changes in stool characteristics in children. If it persists for a long time, it can lead to indigestion and malnutrition. In cases where the symptoms are not severe, reducing the intake of lactose-containing foods and adding lactase can help alleviate the symptoms. However, if the condition has been prolonged and is accompanied by complications such as malnutrition, it is advisable to temporarily stop the intake of formula and dairy products and feed lactose-free formula until the symptoms improve and then resume a normal diet. Lactose intolerance can be congenital or acquired, but the treatment method is through dietary control.

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Written by Si Li Li

Gastroenterology

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Does lactose intolerance cause mucus in the stool?

Lactose intolerance is caused by a deficiency of lactase, the enzyme that digests lactose, typically resulting in symptoms such as diarrhea, bloating, and abdominal pain after consuming dairy products. It is relatively common among Chinese people. Unlike lactose allergy, this condition only requires controlling the intake of lactose, rather than completely avoiding dairy products. This disease generally does not present symptoms like passing mucus. The presence of mucus in stool usually suggests the possibility of chronic colitis. In such cases, it is advised to undergo a colonoscopy to examine the intestinal mucosa for mucus attachment, or signs of hyperemia, erosion, or edema.

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Written by Wu Hai Wu

Gastroenterology

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What to eat when lactose intolerance causes nausea

Patients with lactose intolerance primarily show clinical symptoms related to the digestive tract such as bloating, increased bowel sounds, intestinal colic, diarrhea, nausea, vomiting, and more. Some patients experience reduced intestinal motility, leading to constipation, and the severity of symptoms is somewhat related to the amount of dairy products consumed. If a patient with lactose intolerance is experiencing nausea, they should eat light foods and avoid dairy products as much as possible. Patients with lactose intolerance should seek medical attention in a timely manner. When visiting a doctor, they should provide detailed medical history information to help the doctor determine the correlation between the clinical symptoms and lactose intolerance.

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Written by Wu Ben Rong

Pediatrics

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What kind of formula should a baby with lactose intolerance drink?

If a child is lactose intolerant, parents can go to a maternity and baby store to pick a lactose-free infant formula. Lactose intolerance is due to a deficiency or insufficient activity of lactase in the small intestinal mucosa, which results in the inability to completely digest and break down the lactose in breast milk or cow's milk. Common symptoms may include weeks of diarrhea, bloating, and abdominal pain. Primary lactose intolerance is usually caused by genetic factors, while secondary lactose intolerance is generally caused by gastroenteritis. When a child exhibits the aforementioned symptoms, parents need to improve the child's diet and switch to a lactose-free infant formula, which not only ensures the child's nutritional intake but also alleviates the condition of lactose intolerance. If necessary, they should visit a formal hospital for relevant examinations and treatment.

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Written by Tong Peng

Pediatrics

1min 11sec

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Can infant lactose intolerance be self-healing?

Whether infant lactose intolerance can self-heal needs to be identified as either congenital or secondary. If it is congenital lactose intolerance, it means that the baby's own intestines cannot produce lactase, and thus the symptoms of lactose intolerance cannot be alleviated. However, secondary lactose intolerance, such as that caused by chronic diarrhea or infection which leads to a reduction in lactase, can be recoverable. The reduction in lactase production caused by chronic diarrhea does not mean that the intestines have lost their normal function to secrete lactase. Therefore, by using lactose-free formula or avoiding foods containing lactose, the normal intestinal flora can be repaired, achieving relief from the symptoms of lactose intolerance. Additionally, if there is a viral infection, particularly rotavirus infection-induced lactose intolerance, it can also be alleviated through dietary adjustments to promote the repair of the intestinal flora. Therefore, the treatment of lactose intolerance should vary from person to person, and it is important to identify early whether it is primary or secondary.

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Written by Yan Xin Liang

Pediatrics

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What should I do if the baby is lactose intolerant?

If the baby is lactose intolerant and does not have frequent bowel movements and it does not affect their growth and development, then no special treatment is needed. If there is frequent diarrhea and slow weight gain, then an adjustment in diet is necessary. If there is significant acute diarrhea accompanied by dehydration, we should initially rehydrate the infant either intravenously or orally to correct the dehydration. At the same time, you can start with some lactose-free formula and, after the diarrhea stops, gradually increase the amount of breast milk or other formulas based on the child's condition. Regardless of whatever food substitute is used, the overall principle is to not decrease the nutritional needs of the child. As solid foods are introduced and breast milk or cow's milk is decreased, diarrhea will gradually cease. If diarrhea does not subside, oral lactase enzyme preparations can also be provided to supplement lactase enzyme therapy.