diarrhea MRI what to expect

Overview

An MRI (magnetic resonance imaging) scan uses strong magnets and radio waves to create detailed pictures of the inside of your body. For diarrhea, an MRI is sometimes used to look for causes of chronic (long-lasting) or severe diarrhea, such as inflammation in the bowel.

An MRI for diarrhea is not common. It is reserved for cases where other tests have not found the cause, or to check for conditions like Crohn's disease or colitis.

This test may be recommended for people with persistent diarrhea that has lasted weeks or months, or for those with other symptoms like blood in stool, weight loss, or abdominal pain.

Symptoms

Common symptoms

• Frequent loose or watery stools
• Abdominal pain or cramping
• Bloating
• Urgent need to have a bowel movement

Symptoms in children

• Diarrhea that lasts more than a few days
• Signs of dehydration like dry mouth, no tears when crying, or fewer wet nappies
• High fever
• Blood in stool

Symptoms in older adults

• Diarrhea that leads to dehydration quickly
• Dizziness or confusion
• Not passing urine for many hours
• Severe weakness

Causes

Main causes

• Infections from viruses, bacteria, or parasites
• Food intolerance (e.g., lactose intolerance)
• Irritable bowel syndrome (IBS)
• Inflammatory bowel disease (Crohn's disease or ulcerative colitis)
• Medication side effects

Risk factors

• Recent travel to areas with poor sanitation
• Weakened immune system
• Use of antibiotics
• Chronic health conditions like diabetes or thyroid problems

When to see a doctor

See a doctor urgently if:

• Diarrhea that lasts more than 2 days for adults, or more than 24 hours for children
• Signs of dehydration
• Blood or pus in your stool
• Severe pain
• Fever over 38°C

Book a routine appointment if:

• Mild diarrhea that does not improve after a few days of home care
• You have ongoing diarrhea that comes and goes
• You have unintentional weight loss

Diagnosis

Your doctor will ask about your symptoms, medical history, and may perform a physical exam. They may order stool tests, blood tests, or imaging like an MRI if they suspect an ongoing condition.

Tests that may be done

• Stool culture to check for infection
• Blood tests to look for signs of inflammation or anaemia
• Colonoscopy with biopsy
• MRI of the abdomen and pelvis

What to expect at your appointment

For an MRI for diarrhoea, you will be asked to drink a contrast liquid (like a milkshake) before the scan. This helps highlight your bowel. You will lie on a table that slides into the MRI machine. You will need to stay very still. The test takes about 30 minutes to 1 hour. It is painless but can be noisy – you will get earplugs or headphones. You can talk to the technician if you feel anxious.

Treatment

Treatment for diarrhoea depends on the cause. For acute infections, rest and fluids are usually enough. For chronic conditions like Crohn’s, treatment aims to reduce inflammation and control symptoms.

Self-care at home

• Drink plenty of water, clear broths, or oral rehydration solutions
• Eat small, frequent meals of bland foods like rice, toast, bananas
• Avoid dairy, fatty foods, caffeine, and alcohol until you recover
• Rest as much as possible
• Wash your hands often to prevent spreading infection

Medical treatments

Depending on the cause, your doctor may recommend medications to slow bowel movements, treat infection, or reduce inflammation. For chronic conditions, you may be prescribed long-term treatments such as anti-inflammatory drugs, immune system suppressors, or biologic therapies. Always talk to your doctor before taking any over-the-counter medicine.

When is surgery considered?

Surgery is rarely needed for diarrhoea itself, but if an underlying condition like Crohn’s causes a blockage or severe damage, part of the bowel may be removed.

Living with this condition

If you have chronic diarrhoea, planning ahead can help. Know where toilets are when you go out, carry a change of clothes and wet wipes, and discuss your condition with your employer or school if needed.

Lifestyle tips

• Keep a food diary to identify triggers
• Practice good hand hygiene
• Stay hydrated throughout the day
• Consider stress management techniques like deep breathing or meditation

Diet and exercise

Eat a balanced diet with plenty of fibre, but be cautious with high-fibre foods if they worsen your symptoms. Gentle exercise like walking can help digestion and reduce stress.

Mental health and emotional wellbeing

Dealing with ongoing diarrhoea can be embarrassing and stressful. It is normal to feel anxious or low. Talk to your doctor about support groups or counselling if you need emotional help.

Prevention

Most acute diarrhoea can be prevented with good hygiene and food safety. Chronic diarrhoea from conditions like IBD cannot always be prevented, but managing triggers can reduce flare-ups.

Vaccines

Rotavirus vaccine is given to infants to prevent severe diarrhoea from that virus.

Screening programmes

For people at higher risk of bowel cancer, regular screening (like colonoscopy) can detect problems early. If you have chronic diarrhoea with a family history of bowel cancer, ask your doctor about screening.

Complications

If left untreated

• Dehydration (loss of water and salts)
• Electrolyte imbalance (affecting heart and muscles)
• Malnutrition (not getting enough nutrients)
• Weight loss
• In severe cases, kidney failure or shock

Long-term outlook

For most people, diarrhoea clears up in a few days without complications. Chronic diarrhoea can be managed well with treatment and lifestyle changes. MRI and other tests help your doctor find the right cause so you can get the best care. With proper support, most people improve.

Find support

External links open third-party websites. Ruqelo Health is not responsible for external content. Listing an organisation does not imply endorsement.