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Diarrhea Gastroenterologist - Dr. Rishi Chadha

Diarrhea is common loose stools which can be as a result of infections, diet, stress or illness. Dr. Rishi Chadha in GastroDoxs is the expert in the diagnosis and customized treatment of patients in Houston, whose lifestyle change, as well as complex measures, will alleviate the symptoms and quickly heal the gut.

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Texas Medical Board
Harris County Medical Society
American College of Gastroenterology
American Society for Gastrointestinal Endoscopy
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Houston Methodist leading Medicine
HCA Houston Healthcare
Rishi Chadha

About the Expert

Dr. Rishi Chadha, MD is a board‑certified gastroenterologist who specializes in preventive gastroenterology, colorectal cancer screening, and minimally invasive endoscopic procedures. He completed his fellowship at Sunrise Health GME in Las Vegas and previously trained in internal medicine at St. Vincent’s Medical Center in Connecticut.

What Is Diarrhea?

  • Loose, watery stools occurring more often than normal
  • Can last from a few hours up to several days
  • It's a symptom not a disease often coded as ICD-10 R19.7

Common Symptoms

  • Three or more loose stools per day
  • Abdominal cramps or belly pain
  • Urgent need to use the bathroom
  • Gas or bloating
  • Dehydration signs: dry mouth, dark urine, dizziness

Common Causes and Risk Factors

  • Infections: viruses, bacteria, or parasites
  • Food reactions: spicy foods, dairy, artificial sweeteners
  • Medications: antibiotics disrupting gut bacteria
  • Stress and anxiety affecting digestion
  • Hormonal changes during pregnancy
  • Chronic GI disorders: IBS, IBD, celiac disease

How Dr. Rishi Diagnoses Diarrhea?

Dr. Rishi Chadha uses a step-by-step approach:

Medical History and Physical Exam

He will examine your symptom history, nutrition changes, tobacco/alcohol consumption, recent history of travel, stress, medication, previous health concerns.

Stool and Blood Tests

We examine stool samples to test the presence of pathogens and blood samples to check on the presence of inflammation or infection markers and malabsorption.

Breath Tests

The malabsorption of carbohydrates or bacterial proliferation in the small intestine is identified using the lactose and SIBO breath tests.

Endoscopic Evaluation

  • Colonoscopy examines the colon lining directly, rules out IBD or colitis, and allows for biopsy sampling.
  • Capsule endoscopy visualizes the small intestine to identify sources of chronic diarrhea beyond the reach of standard scopes.

Imaging Studies

Abdominal ultrasound, CT or MRI can be requested in order to evaluate structural problems, masses, or inflamed organs.

Rishi Chadha
Treatment

Our Houston team offers a full range of care for diarrhea relief.

Lifestyle and Diet Changes

  • Add more liquids of water and electrolytes.
  • Use the BRAT diet: bananas, rice, applesauce, and toast.
  • Recognize and prevent personal foods.
  • Probiotics may be used to recuperate healthy gut bacteria.

Medications

  • Loperamide or bismuth subsalicylate symptomatic treatment in the short term.
  • When suspected that the bile acid is malabsorbed, bile acid binders are used.
  • Only with a confirmed bacterial infection, targeted antibiotics.

State-of-the-Art Tests and Procedures

  • Colonoscopy to check colitis, receive biopsies or eliminate structural problems.
  • A closer examination of the small intestine with capsule endoscopy.
  • Possible endoscopic mucosal resection of abnormal tissue.
Rishi Chadha

About the Author

Dr. Rishi Chadha, MD is a board‑certified gastroenterologist who specializes in preventive gastroenterology, colorectal cancer screening, and minimally invasive endoscopic procedures. He completed his fellowship at Sunrise Health GME in Las Vegas and previously trained in internal medicine at St. Vincent’s Medical Center in Connecticut.

Frequently Asked Questions

What causes sudden diarrhea?

In the majority of cases, it is provoked by an ingested substance, a stomach infection (viral, bacterial or parasitic), or excessive stress levels.

Is diarrhea necessarily associated with pregnancy?

No. Although early pregnancy is caused by hormonal changes, which lead to diarrhea, countless other factors can be the causative agent such as diet or infection.

Can stress cause diarrhea?

Yes. Stress and anxiety may also change gut motility and fluid regulation resulting in loose and urgent stools.

What is the emergency in the case of diarrhea?

Get urgent treatment in case of blood in your stool, fever with more than 102 deg F (38.9 deg C), extreme dehydration (dry mouth, dizzy spells), and unmanageable pain.

Does the frequent diarrhea imply the cancer?

Not necessarily. IBS, IBD, celiac disease, or any other non-cancerous conditions may result in chronic diarrhea. Intraprostatic prostate should never be ignored.

When should I see a doctor?

When diarrhea continues past two days or sooner when you are feeling weak, dizzy, feeling severely dehydrated or showing some frightening signs, such as bloody diarrheal.

Is there any diarrhea caused by antibiotics?

Yes. Antibiotics may change the equilibrium of the healthy bacteria in your gut and this is why you may develop antibiotic-associated diarrhea.

What are the foods which are helpful in preventing diarrhea?

BrAT: This diet should be followed - bananas, rice, applesauce, and toast - and lots of water or oral rehydration fluid to replace the lost electrolytes.

Should I take probiotics?

In many cases, yes. Gut flora can be restored with the help of probiotics. The question to ask Dr. Chadha is what strain and dose to use.

What is the code in ICD-10 of diarrhea?

The major code is the R19.7 of unspecified diarrhea. The K59.1 may be the functional diarrhea.

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