Why do you get real bad headaches and feel nauseous?

There are many possible causes for severe headaches accompanied by nausea. The cause of headaches and nausea can vary widely, here are some common reasons why you might experience these symptoms together:

1. Migraine: Migraines are a neurological condition characterized by severe headaches, often accompanied by nausea and vomiting.

Migraines can also cause sensitivity to light, sound, or smells, as well as dizziness, visual disturbances, and numbness or tingling in the extremities.

2. Tension Headaches: Tension headaches are the most common type of headache and while not as severe as migraines, they can also cause nausea in some individuals.

3. Sinus Infection: Headaches and nausea are common symptoms of sinus infections, which occur when the sinuses become inflamed or infected. Other symptoms of sinus infections may include facial pressure or pain, nasal congestion or discharge, and fever.

4. Dehydration: Severe dehydration can lead to headaches and nausea as the body lacks the fluids it needs to function properly.

5. Menstrual Cycle: Hormonal changes during a woman's menstrual cycle, particularly during menstruation or PMS (Premenstrual Syndrome), can cause headaches and nausea.

6. Medication Side Effects: Certain medications, such as painkillers, antibiotics, or chemotherapy drugs, can have side effects that include headaches and nausea.

7. Caffeine Withdrawal: People who regularly consume caffeine may experience headaches and nausea if they suddenly stop or drastically reduce their intake.

8. High Blood Pressure: Severe, sudden headaches accompanied by nausea can sometimes be a sign of dangerously high blood pressure.

9. Motion Sickness: Headaches and nausea are common symptoms of motion sickness, which occurs when the inner ear is unable to maintain balance during travel or movement.

10. Food Allergies or Intolerances: Eating foods that trigger allergies or intolerances can lead to headaches and nausea along with other digestive issues.

It's important to note that persistent or severe headaches accompanied by nausea should be evaluated by a healthcare professional, especially if you have never experienced them before or if they are accompanied by other concerning symptoms such as confusion, fever, or vision changes. The doctor can accurately determine the cause of the headaches and nausea and recommend appropriate treatment or further investigation if needed.