can water in the ear  cause a headache
Enlarged adenoids and allergies can also interfere with drainage. Ear infections can occur at any age, but they are more common in children. Headaches may occur in conjunction with ear pain or on their own. Nearly anything can be responsible for a headache. Stress, muscle tension, changes in diet or sleep patterns, infections, medications, certain scents, air pollution and vision problems are some common causes. Infections, particularly in the sinuses, and other medical conditions, such as hypoglycemia and meningitis, can also trigger headaches.