Dizziness is feeling disoriented, lightheadedness or being unsteady. Dizziness changes how you perceive your surroundings. You may feel that your environment is shifting or spinning around. You may also experience vertigo. Vertigo occurs when your feel like you are spinning. You may feel like you are woozy, floating or swaying. This feeling may not be relieved by lying down or standing still. Dizziness is not a disease or a disorder, but one of the signs that you are suffering from an underlying medical condition. The treatment for this symptom depends on what is causing the dizzy feeling such as pulmonary hypertension.Next