Manifestation of infectionNote the celiac-like villous atrophy and the occasional foul taste in the mouth.
...
Colonization of the gut results in inflammation and villous atrophy, reducing the gut's absorptive capability. In humans, infection is symptomatic only about 50% of the time, and protocol for treating asymptomatic individuals is controversial.[4] Symptoms of infection include (in order of frequency) diarrhea, malaise, excessive gas (often flatulence or a foul or sulphuric-tasting belch, which has been known to be so nauseating in taste that it can cause the infected person to vomit), steatorrhoea (pale, foul smelling, greasy stools), epigastric pain, bloating, nausea, diminished interest in food, possible (but rare) vomiting which is often violent, and weight loss.[4] Pus, mucus and blood are occasionally present in the stool. It usually causes "explosive diarrhea" and while unpleasant, is not fatal. In healthy individuals, the condition is usually self-limiting, although the infection can be prolonged in patients who are immunocompromised, or who have decreased gastric acid secretion.[4]
People with recurring Giardia infections, particularly those with a lack of the Immunoglobulin A antibody, may develop chronic disease.
Lactase deficiency may develop in an infection with Giardia, however this usually does not persist for more than a few weeks, and a full recovery is the norm.[citation needed]
Some studies have shown that giardiasis should be considered as a cause of vitamin B12 deficiency, this a result of the problems caused within the intestinal absorption system.[9]
Chronic diarrheal illnessGiardiasis is also associated with a rash. The Google snippet for the linked site mentions "A reddish, scaly rash often located over the surfaces of the elbows, knees, ...", but glancing over the 18 pages devoted to giardiasis, I didn't find that, and can't guarantee it even refers to giardiasis, if it exists at all.
* Diarrhea: Stools are often greasy, foul smelling, yellowish, and may alternate between diarrhea and constipation.
* Abdominal pain worsens with eating
* Occasional headaches
* Weight loss
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Stress can certainly be a cause in itself. I know because I had IBS symptoms and had everything checked out. After dealing with the stress, the symptoms went away. And you sound worried about this in a way that may be exacerbating it.
That said, as long as you're checking things out, also check your thyroid levels. Hyperthyroidism can cause stress and IBS in itself.
posted by vacapinta at 8:40 AM on July 4, 2012