Lightheadedness is a sensation of feeling faint or dizzy, often described as a feeling of being unsteady or as if you might faint. It can occur due to various reasons, including dehydration, low blood pressure, or standing up too quickly. This feeling is usually temporary and can be relieved by sitting or lying down. In some cases, lightheadedness may be linked to more serious conditions, such as anemia or inner ear disorders. If it occurs frequently or is accompanied by other symptoms like chest pain or shortness of breath, it is important to seek medical attention to determine the underlying cause.