No bowel movement for two days, suddenly experiencing abdominal pain, passing black and loose stools

Diarrhea refers to loose stools, and stomach pain refers to abdominal pain. Generally, if a person hasn't had a bowel movement for two days and then suddenly experiences abdominal pain, black stools, and diarrhea, it is usually caused by improper diet, indigestion, irritable bowel syndrome (IBS), acute gastroenteritis, gastric ulcers, or other conditions. Targeted treatment should be based on the specific underlying cause. The detailed analysis is as follows:

1. Improper Diet

If the patient has recently consumed excessive amounts of hard-to-digest foods—especially animal organs or blood products—this may lead to indigestion, causing abnormal bowel movements and abdominal pain. In such cases, attention should be paid to improving dietary habits. If no other discomfort is present, there is generally no need for concern.

2. Indigestion

Indigestion can impair normal digestion and absorption of food, leading to either diarrhea or constipation. For example, excess stomach acid, gallbladder issues, insufficient pancreatic enzymes, or food intolerances may contribute to indigestion. These problems can cause abdominal pain and affect bowel movements, possibly manifesting as black stools or diarrhea. Medications such as Baohe Pills or Jianwei Xiaoshi Tablets may be used under medical guidance for treatment.

3. Irritable Bowel Syndrome (IBS)

IBS is a functional gastrointestinal disorder. Some patients with IBS may experience a mixed type, characterized by alternating episodes of diarrhea and constipation. Abdominal pain is typically a hallmark symptom of IBS. Symptom relief may be achieved with medications such as mebeverine hydrochloride tablets or pinaverium bromide tablets, used under medical supervision.

4. Acute Gastroenteritis

This is an acute inflammatory condition affecting the mucous membranes of the stomach and intestines. Due to inflammation, the gastrointestinal mucosa becomes damaged, disrupting normal digestive function and resulting in symptoms such as abnormal stools, abdominal pain, and diarrhea. Patients should take medications such as norfloxacin capsules or cefixime capsules under a doctor's guidance.

5. Gastric Ulcer

If a patient has a gastric ulcer, an open sore forms on the stomach lining, which can result in black stools along with symptoms such as abdominal pain, bloating, and nausea. Some patients may also experience diarrhea. It is generally recommended that patients take medications such as omeprazole enteric-coated capsules or rabeprazole sodium enteric-coated tablets as directed by a physician to alleviate symptoms.

Patients should seek timely medical care to avoid delaying diagnosis and treatment.