What could cause sudden vomiting with no other symptoms in a young healthy female?

There are several possible causes of sudden vomiting with no other symptoms in a young healthy female:

1. Pregnancy: One of the earliest symptoms of pregnancy can be morning sickness, which is characterized by nausea and vomiting, typically in the morning.

2. Food poisoning: Consuming contaminated food or drinks can lead to food poisoning, causing sudden vomiting as the body's reaction to expel the harmful substances.

3. Viral gastroenteritis: Also known as "stomach flu", it's a common viral infection that affects the digestive system, often causing vomiting, diarrhea, and abdominal pain.

4. Motion sickness: Experienced during travel by car, boat, or plane, motion sickness can disrupt the inner ear's balance system, resulting in nausea and vomiting.

5. Migraines: Some individuals experience vomiting as a symptom of migraines or severe headaches.

6. Anxiety and stress: Extreme anxiety or stress can sometimes trigger vomiting as a physical response to emotional distress.

7. Medication side effects: Certain medications, such as those used for chemotherapy or hormonal treatments, may cause nausea and vomiting as side effects.

8. Alcohol consumption: Excessive alcohol intake can lead to nausea and vomiting, especially if consumed rapidly or on an empty stomach.

9. Menstrual cycle: Some women experience nausea and vomiting as part of their premenstrual syndrome (PMS).

10. Underlying medical conditions: In rare cases, sudden vomiting in young healthy females could be a sign of certain underlying medical conditions like digestive disorders, hormonal imbalances, or rare infections.

It's always essential to consult a healthcare professional if the vomiting doesn't resolve after a short period or is accompanied by other concerning symptoms.