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Headaches, Migraines, and Nausea

Migraines are often accompanied by stomach problems. In fact, eight out of every 10 people in the U.S. who are diagnosed with migraines report that their headaches cause nausea.

Migraines are the type of headache most likely to make you nauseated. There are, though, other causes of head pain that can also result in an upset stomach. It's important to consult a doctor about your symptoms. Your doctor can determine the cause and the appropriate treatment for your headaches and nausea.

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What Headaches Other Than Migraines Can Cause Nausea?

In addition to migraines, there are multiple conditions and illnesses that can cause headaches with nausea or vomiting. The doctor will ask about your specific symptoms and history. What you tell the doctor will help determine whether your headache and nausea are migraine-related or the result of another condition or illness. Other conditions that might cause headaches and nausea include:

  • Cold, flu, or stomach flu. Common viruses that cause cold, flu, and stomach flu -- or gastroenteritis -- can cause headache and nausea. Both can range in intensity from mild to severe. Unlike migraines, these conditions are often accompanied by other signs of viral illness. For instance, you may have a runny nose, diarrhea, chills, body aches, and fever. 
  • Meningitis. A horrible headache accompanied by extreme sensitivity to light and nausea may sound like a classic migraine. But if it is also accompanied by an extremely stiff neck, with or without fever, it could be meningitis. 
  • Cluster headache. Nausea is one of the factors commonly used to distinguish between migraines and other types of headaches. That includes tension headaches and cluster headaches. But there is some evidence that suggests some people with cluster headaches do experience nausea when attacks occur. Cluster headaches are repeated, excruciating, one-sided headaches.

How Are Migraines and Nausea Related?

It's unclear why millions of people suffer nausea with their migraines.

Current thinking suggests that migraines occur when certain nerves in the brain signal blood vessels on the brain's surface to enlarge. Changes in estrogen levels are also thought to play a role. That may be why more women than men experience migraines. Blood vessels on the brain's surface also swell when levels of the neurotransmitter serotonin drop. It's possible that people with low levels of serotonin may be more likely to experience migraines. Low levels of serotonin may also be linked to motion sickness and nausea.

Certain groups of people are more likely to experience nausea with a migraine. This includes women and people who are prone to motion sickness. Between 5% and 20% of the general population experiences motion sickness. And movement-related nausea is experienced by about 50% of the people who get migraines.

Certain types of migraine are likely to produce symptoms of nausea or vomiting. So are some migraine variants, which are migraines without headache. These include:

  • Migraine with or without aura. Migraines without aura are more common and may cause severe head pain, vision problems, vertigo, sensitivity to light, and nausea. People who have migraines with aura typically experience warning symptoms 20 minutes to one hour before the headache begins. These warning symptoms include visual disturbances and dizziness. 
  • Abdominal migraine. Most migraines cause headaches. In rare instances, children experience migraines that cause stomach pain instead. When attacks occur, they can cause children to feel nauseated or vomit. An attack may also cause a loss of appetite. People who experience abdominal migraines as children are likely to have migraine headaches in adulthood. 
  • Benign paroxysmal vertigo. This migraine variant is most often seen in toddlers. When it occurs, the toddler will seem to suddenly lose balance and may be unable to walk. The condition often causes children to vomit. Then the vertigo resolves after a period of a few minutes to several hours. 
  • Cyclic vomiting syndrome. This troubling condition occurs most often in children. Cyclic vomiting syndrome causes people to have periods of nausea and vomiting that can last anywhere from hours to days.

The exact relationship between cyclic vomiting syndrome and migraine has not been determined. The two conditions, though, do seem to be connected. They share many of the same triggers, including stress. Additionally, many children who have cyclic vomiting syndrome go on to develop migraine headaches or have relatives who suffer from migraine headaches.

WebMD Medical Reference

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