Irritable Bowel Syndrome

A woman outside the bathroom with bowel cramps from bloating

What Is Irritable Bowel Syndrome?

Spastic colon, also called irritable bowel syndrome or IBS, is when you have gas, bloating, diarrhea and/or constipation with a negative medical workup. When doctors do not know what is causing your symptoms, we give it the label "spastic colon," instead of more effectively searching for the source of your symptoms.

What May Cause Irritable Bowel Syndrome?

The most effective way to eliminate spastic colon is to treat the underlying causes. This condition is sometimes caused by food sensitivity such as to lactose in milk or fructose in sodas. More often, however, it is caused by an infection, and most patients' spastic colon resolves when the underlying bacterial, fungal, and parasitic bowel infections are treated.

Unfortunately, there is no reliable test for fungal overgrowth, which is why this is missed. Suspect yeast overgrowth if you also have chronic sinusitis or nasal congestion. These also often go away when the fungal infection is treated — along with the spastic colon.

Small intestinal bacterial overgrowth (called SIBO) can also mimic spastic colon and responds to the same treatments along with treating low thyroid issues (even if blood testing is normal). SIBO, as well as lactose and fructose intolerance, can be diagnosed by Hydrogen Breath Testing (HBT), though these are usually not needed.

Treating Irritable Bowel Syndrome

Possible Causes and Relief for IBS Symptoms

  • Lactose Intolerance

    Stop milk and fructose (i.e., sodas) for 10 days. If symptoms resolve off these, stop sodas and try lactose-free milk products.

    With lactose intolerance, most people can have some milk. They just don’t have the enzymes to digest more than a certain amount, and then it causes gas (not dangerous — just a nuisance). Taking the missing enzyme by mouth (called lactase — found in products such as LactAid may allow you to tolerate more dairy products. Avoid excess sweets.

  • Fiber and Hydration

    If constipation is a predominant symptom, increase fiber and water, and take 200-300 milligrams (mg) of magnesium a day.

  • Bowel Parasites

    Check for and treat parasites. Do stool testing for parasites only at a lab that specializes in this (e.g., Genova Labs by mail, see

  • Intestinal Flora

    Take an enteric-coated probiotic to support healthy bowel function. If not enteric coated, your stomach acid will simply kill the healthy bacteria. I begin with a high potency (60-100 billion bacteria) probiotic called Optima 1 a day for 1 month followed by the Pearls Elite 1 a day.

  • Cramps from Bloating

    For gas pains, begin with enteric-coated peppermint oil caps, which eases the cramps.

Check for SIBO

If symptoms persist, ask your doctor to do a Hydrogen Breath Test (HBT) to look for small intestinal bacterial overgrowth, or "SIBO" (bacterial overgrowth). If the HBT shows SIBO/infections, or for persistent severe IBS, I suggest using the antibiotic Rifaximin (Xifaxin) 550 mg/day for 7-14 days and also treat for an underactive thyroid, a main cause of SIBO. This antibiotic is expensive, so if not covered by insurance, I will sometimes instead use Neomycin 500 mg by mouth 4x day for 10 days. For spastic colon with diarrhea, combining neomycin and Rifaximin can be most effective.

If the SIBO tests are negative, treat for food allergies using an acupressure technique by NAET.

For bloating, chew over-the-counter Mylicon (simethicone) tablets.

More SIBO Information Online


Dr. Jacob Teitelbaum, MD

Jacob Teitelbaum, MD, is one of the most frequently quoted long COVID, fibromyalgia, energy, and pain medical authorities in the world.

He is the author of 12 books, including the bestselling From Fatigued to Fantastic and the popular free Smart Phone app Cures A-Z. He is the lead author of eight studies on effective treatment for fibromyalgia and chronic fatigue syndrome.

Dr. Teitelbaum appears often as a guest on news and talk shows nationwide including Good Morning America, Oprah & Friends, CNN, and FoxNewsHealth.