What are the reasons for a child's diarrhea for more than a year?

Patient's question:

Patient Gender: My child, male, 13 years old, has had diarrhea for 1 month. The stool is watery, with one bowel movement every 15 minutes. His diet is normal. He has undergone blood tests, colonoscopy, gastroscopy, and Helicobacter pylori tests, but only superficial gastric ulcers were found, with no other diseases. However, the diarrhea persists. Last week, he was treated at Shanxi Children's Hospital, where he took anti-diarrheal medication. At that time, his bowel movements improved, but he continued to experience upper abdominal pain. Two days later, the diarrhea started again. Despite treatment from multiple specialists, it has been ineffective. We don't know what to do either, nor do we know what the disease is. His diarrhea has been intermittent for 1.5 years, with episodes occurring roughly once a month, each lasting about 10 days. He used to take medication for gastric spasms

Doctor's answer:

Hello: Based on the situation you described, it is recommended to actively seek hospital treatment to prevent the child from developing dehydration symptoms!
(1) Remove the trigger, rest in bed, and consume light, easily digestible foods.
(2) If the pathogen is identified, medication should be administered based on drug sensitivity tests, or Huanglian (Berberine) 0.1–0.2g or PPA 0.5–1.0g can be chosen, taken 3–4 times daily orally.
(3) Symptomatic treatment: abdominal pain can be treated with atropine. Patients with dehydration should receive fluid replacement, and electrolyte imbalances and acidosis should be corrected. In cases of shock, shock treatment should be administered.
Therefore, the priority now is to seek hospital treatment while also undergoing a stool examination to determine the underlying cause. Then, specific treatment and medication can be determined.