Definition: Aquocapsulitis refers to inflammation or swelling in the head, especially around the eyes. It's characterized by redness, pain, and possibly pus. The cause can be due to a variety of conditions including bacterial or viral infections. Detailed definition: Aquocapsulitis is inflammation or swelling in the head or neck caused by bacteria or viruses that infect the eye or other part of the body. Common causes include colds, allergies, and bacterial overgrowth like pneumonia or sinusitis. Symptoms can range from a mild headache to severe pain and redness. Treatment depends on the underlying cause and may involve antibiotics, anti-inflammatory medication, and perhaps an eye exam for confirmation.