One theory is that brain chemicals released as a result of anxiety disrupt the balance of bacteria in the gut, with the knock-on effect of causing nausea. Research published in General Hospital Psychiatry in 2002 found that patients with anxiety are three times more likely to suffer long-term nausea than people without the condition. But it can also be a long-term effect of the winter vomiting virus and, more surprisingly, is linked to anxiety and depression - with at least one study suggesting that these conditions are such common triggers that patients should be checked for them before being sent for invasive tests for possible gastric causes. The causes range from chemotherapy to persistent stomach conditions (such as chronic indigestion). Recent research found that a quarter of women affected by severe, persistent nausea and vomiting during pregnancy suffered suicidal thoughts as a result.Ĭhronic nausea is common, with as many as one in eight people suffering from it on a regular basis, and many more affected intermittently, according to experts including Dr Adam Farmer, a consultant gastroenterologist at the University Hospitals of North Midlands.
Experts say that for many people living with long-term conditions, the nausea this causes can be the worst part of their illness
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