A sudden ringing sensation followed by a fall can be caused by various issues, such as a brief drop in blood pressure, an inner ear problem like vertigo, a simple fainting episode (syncope), or a temporary reduction in blood flow to the brain (known as a transient ischaemic attack or mini-stroke). Because this involved a loss of balance or consciousness, it is important to seek medical advice promptly to rule out any serious underlying cardiovascular or neurological conditions. You should keep a record of any other symptoms, such as dizziness or nausea, and visit a doctor for a physical examination and any necessary tests to ensure your safety.