Migraines are the most common cause of headaches that occur with nausea. Dehydration and low blood sugar are also frequently responsible. Some causes are more serious. Several affect the brain, such as meningitis, brain aneurysms, and tumors.

Why do I feel nauseous headache and weak?

Headaches, nausea, and fatigue have many causes. When they appear together, they can be symptoms of conditions such as the flu, migraines, or CFS. While occasionally experiencing these symptoms is usually nothing to be concerned about, people should see a doctor if they are affecting daily activities.

Can headaches trigger nausea?

Migraines can cause a variety of symptoms, including nausea, dizziness, sensitivity to light, and severe headache pain. They're often preceded by a visual or sensory disturbance, called an aura. Other conditions associated with headache and nausea include dehydration and low blood sugar.