What causes persistent nausea and vomiting?
Nausea and vomiting are symptoms experienced by most people. In fact, there are numerous potential causes for these symptoms; therefore, if they persist, it is advisable to seek medical evaluation promptly to avoid missing the optimal window for treatment. So, what could be causing persistent nausea and vomiting? Below, we address this question.

What Causes Persistent Nausea and Vomiting?
1. Chronic Pharyngitis
Persistent nausea can stem from various causes, one of which is chronic pharyngitis—often triggered by environmental factors and air pollution. This condition commonly causes throat discomfort; in more severe cases, patients may experience dry coughing and excessive, difficult-to-expectorate phlegm. Given its prolonged course, a thorough medical evaluation is recommended. Additionally, patients should abstain from smoking and alcohol, and pay attention to dietary habits.

2. Gastrointestinal Disorders
Gastrointestinal disorders also frequently cause nausea and vomiting. Examples include acute gastroenteritis, gastroparesis, peptic ulcer disease, and dysentery—all of which may present with nausea. In more severe cases, additional symptoms such as abdominal pain, diarrhea, and vomiting may occur.

3. Pregnancy-Related Nausea (Morning Sickness)
Nausea and vomiting are nearly universal during pregnancy, especially in early gestation, when symptoms tend to be most pronounced. Many women find relief by consuming sour foods. Thus, any woman experiencing persistent nausea and vomiting should seek timely medical evaluation to confirm or rule out pregnancy—and to exclude other possible underlying conditions.
The above outlines the primary causes of persistent nausea and vomiting. We hope this information is helpful to you.