Dizziness is a term used to describe everything from feeling faint or lightheaded to feeling weak or unsteady. Dizziness that creates the sense that you or your surroundings are spinning or moving is called vertigo. As a child, spinning until you were dizzy may have been great fun. But otherwise, finding the room spinning isn’t pleasant at all. Vertigo is a medical term to describe the feeling of spinning, whirling, or motion either of yourself or your surroundings. This is the same feeling you might have after getting off a merry-go-round or spinning in place. Several diseases of the balance organs of the inner ear can cause vertigo, or it may be a symptom of a tumor or stroke. 
Causes: Lightheadedness happens when there is not enough blood getting to the brain. This can happen if there is a sudden drop in your blood pressure or you are dehydrated from vomiting, diarrhea, fever, or other causes. Many people, especially as they get older, experience lightheadedness if they get up too quickly from a lying or seated position. Lightheadedness often accompanies the flu, hypoglycemia, common cold, or allergies.
Symptoms: People who are dizzy feel as though they are spinning, or objects around them are moving or spinning. They may feel as though they are losing their balance and about to fall. If blood pressure has dropped too low, the person may faint, a temporary loss of consciousness called syncope. People with positional vertigo may experience mild, passing feelings of dizziness just by changing the position of their heads too quickly. Sometimes, however, vertigo may be more severe and last anywhere from hours to days. In these cases, the patient may also experience a loss of hearing, vision problems, nausea and vomiting, and ringing in the ears. People who commonly experience motion sickness will feel dizzy when riding in a vehicle, aircraft, or watercraft.
Causes: Lightheadedness happens when there is not enough blood getting to the brain. This can happen if there is a sudden drop in your blood pressure or you are dehydrated from vomiting, diarrhea, fever, or other causes. Many people, especially as they get older, experience lightheadedness if they get up too quickly from a lying or seated position. Lightheadedness often accompanies the flu, hypoglycemia, common cold, or allergies.
Symptoms: People who are dizzy feel as though they are spinning, or objects around them are moving or spinning. They may feel as though they are losing their balance and about to fall. If blood pressure has dropped too low, the person may faint, a temporary loss of consciousness called syncope. People with positional vertigo may experience mild, passing feelings of dizziness just by changing the position of their heads too quickly. Sometimes, however, vertigo may be more severe and last anywhere from hours to days. In these cases, the patient may also experience a loss of hearing, vision problems, nausea and vomiting, and ringing in the ears. People who commonly experience motion sickness will feel dizzy when riding in a vehicle, aircraft, or watercraft.
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