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What Can Cause Constant Vomiting?

By Christina Edwards
Updated Mar 03, 2024
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Women who are pregnant will often suffer from constant vomiting, especially during the first few months of their pregnancies. Nausea and vomiting are also common side effects of many medications. Frequent vomiting can also be caused by certain medical conditions, including ulcers, food poisoning, and intestinal blockages.

During the first few months of a pregnancy, a woman will often experience frequent bouts of nausea and vomiting. This is often referred to as morning sickness since it is more likely to occur upon waking up, but it can also occur during other times of the day. Nausea and vomiting associated with pregnancy may also triggered by the smell of some foods.

Nausea and vomiting are side effects of a number of different medications, including chemotherapy drugs, antibiotics, opioid pain relievers, and others. Patients who experience constant vomiting as a result of their medications, however, should speak with with a medical professional. In many cases, nausea caused by medications should pass after a few days, but a doctor may want to prescribe a different medication with fewer side effects.

Ulcers are sores or lesions on the walls of the digestive tract, anywhere from the esophagus to the intestines. Patients with ulcers will often experience pain and diarrhea. Nausea and constant vomiting are other possible signs of ulcers in the digestive tract. Depending on the type of ulcer, these symptoms may be more likely to occur either when the stomach is empty or when a person has just eaten.

Food poisoning occurs when dangerous bacteria, such as salmonella, gets into the digestive tract, usually when a person eats contaminated food. Individuals who are suffering from food poisoning will often have symptoms such as abdominal pain, diarrhea, and constant vomiting. Most people recover from food poisoning without medical treatment after a few days, but anyone who becomes dehydrated or has a high fever should see a medical professional.

Another common — and dangerous — cause of constant vomiting is an intestinal blockage. When the bowel is blocked, food and fecal matter cannot pass through it. If this happens, the partially digested food will often back up into the stomach and be regurgitated. Tumors in the digestive tract can cause intestinal blockages, as can foreign objects that have been swallowed. Immediate medical treatment is required.

Anyone who is vomiting constantly for more than a day or two should seek immediate medical attention. Constant vomiting can be indicative of a serious medical condition that needs to be treated as soon as possible. Frequent vomiting can also result in dehydration and malnutrition, which may require medical intervention to prevent serious complications.

The Health Board is dedicated to providing accurate and trustworthy information. We carefully select reputable sources and employ a rigorous fact-checking process to maintain the highest standards. To learn more about our commitment to accuracy, read our editorial process.
Discussion Comments
By anon1004768 — On Apr 17, 2021

I have been vomiting approximately every week or two and it’s been going on for about three years. I am so tired of this. Been to doctors but they find nothing. It smells like well water.

By literally45 — On Aug 12, 2014

I had constant nausea and vomiting off and off for almost a year in the past. After seeing several doctors, I was finally diagnosed with a stomach bacteria that I probably got from sharing a hookah at a hookah cafe I frequented at the time. After a month's worth of antibiotics and quitting smoking altogether, the nausea and vomiting disappeared completely.

If there is constant vomiting, there has got to be a reason for it. It may take some time to figure out the underlying cause, but this symptom doesn't occur for no reason.

By fBoyle — On Aug 11, 2014

@ZipLine-- If it's happening every day, there is definitely something triggering it. Are you on any medications? Does the nausea occur after eating or drinking something in particular? Or after using a medication or oral product?

I once had constant vomiting and it occurred to me that the nausea occurred about twenty minutes of using a throat spray that I was using for sore throat. I realized that it was the medication in the spray that was making me vomit. Another time, I experienced vomiting due to a daily vitamin I was taking.

Something else that can cause unexplained, constant vomiting is anxiety. Are you stressed or worried about something? Anxiety can definitely cause an upset stomach and nausea.

By ZipLine — On Aug 11, 2014

I've been vomiting every day for the past few days and I don't know why. I'm not pregnant and I don't have food poisoning. The nausea seems to come on suddenly and then I can't help but vomit. I just want it to be gone. It's hard to eat when the stomach is upset, so I haven't even eaten properly since three days.

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