Sea sickness is a type of motion sickness that occurs when a person is on a boat or ship. It happens when the brain receives conflicting signals from the inner ear, eyes, and deeper body parts about movement. Symptoms can include dizziness, nausea, vomiting, and sweating. The condition is more common in small boats, where movements are more pronounced. To prevent or alleviate sea sickness, individuals can try focusing on the horizon, staying in well-ventilated areas, or using over-the-counter medications. Staying hydrated and avoiding heavy meals before traveling can also help reduce symptoms.