Dizziness: Lightheadedness and Vertigo
Dizziness is a word that is often used to describe two different feelings. It is important to know exactly what you mean when you say "I feel dizzy," because it can help you and your doctor narrow down the list of possible problems.
- Reference Lightheadedness Opens New Window is a feeling that you are about to faint or "pass out." Although you may feel dizzy, you do not feel as though you or your surroundings are moving. Lightheadedness often goes away or improves when you lie down. If lightheadedness gets worse, it can lead to a feeling of almost fainting or a fainting spell (Reference syncope Opens New Window). You may sometimes feel nauseated or vomit when you are lightheaded.
- Vertigo is a feeling that you or your surroundings are moving when there is no actual movement. You may feel as though you are spinning, whirling, falling, or tilting. When you have Reference severe vertigo, you may feel very nauseated or vomit. You may have trouble walking or standing, and you may lose your balance and fall.
Although dizziness can occur in people of any age, it is more common among older adults. A fear of dizziness can cause older adults to limit their physical and social activities. Dizziness can also lead to falls and other injuries.
It is common to feel lightheaded from time to time. Lightheadedness usually is not caused by a serious problem. It often is caused by a momentary drop in blood pressure and blood flow to your head that occurs when you get up too quickly from a seated or lying position (Reference orthostatic hypotension Opens New Window).
Lightheadedness has many causes, including:
- Illnesses such as the flu or colds. Home treatment of your flu and cold symptoms usually will relieve lightheadedness.
- Vomiting, diarrhea, fevers, and other illnesses that cause Reference dehydration Opens New Window.
- Very deep or rapid breathing (Reference hyperventilation Opens New Window).
- Reference Anxiety Opens New Window and Reference stress Opens New Window.
- The use of tobacco, alcohol, or illegal drugs.
A more serious cause of lightheadedness is bleeding. Most of the time, the location of the bleeding and the need to seek medical care are obvious. But sometimes bleeding is not obvious (occult bleeding). You may have small amounts of bleeding in your Reference digestive tract Opens New Window Reference Opens New Window over days or weeks without noticing the bleeding. When this happens, lightheadedness and fatigue may be the first noticeable symptoms that you are losing blood. Heavy menstrual bleeding also can cause this type of lightheadedness.
An uncommon cause of lightheadedness is an abnormal heart rhythm (Reference arrhythmia Opens New Window), which can cause Reference fainting spells (syncope). Unexplained fainting spells need to be evaluated by a doctor. You can check your heart rate by Reference taking your pulse Opens New Window Reference Opens New Window.
Many prescription and nonprescription Reference medicines can cause lightheadedness or vertigo. The degree of lightheadedness or vertigo that a medicine causes will vary.
Vertigo occurs when there is conflict between the signals sent to the brain by various balance- and position-sensing systems of the body. Your brain uses input from four sensory systems to maintain your sense of balance and orientation to your surroundings.
- Vision gives you information about your position and motion in relationship to the rest of the world. This is an important part of the balance mechanism and often overrides information from the other balance-sensing systems.
- Sensory nerves in your joints allow your brain to keep track of the position of your legs, arms, and torso. Your body is then automatically able to make tiny changes in posture that help you maintain your balance (proprioception).
- Skin pressure sensation gives you information about your body's position and motion in relationship to gravity.
- A portion of the Reference inner ear Opens New Window Reference Opens New Window, called the labyrinth, which includes the semicircular canals, contains specialized cells that detect motion and changes in position. Injury to or diseases of the inner ear can send false signals to the brain indicating that the balance mechanism of the inner ear (labyrinth) detects motion. If these false signals conflict with signals from the other balance and positioning centers of the body, vertigo may occur.
Common causes of vertigo include:
- Inner ear disorders, such as Reference benign paroxysmal positional vertigo (BPPV) Opens New Window, Reference Ménière's disease Opens New Window, Reference vestibular neuritis Opens New Window, or Reference labyrinthitis Opens New Window.
- Injury to the ear or head.
- Reference Migraine headaches Opens New Window, which are painful, debilitating headaches that often occur with vertigo, nausea, vomiting, and sensitivity to light, noise, and smell.
- Decreased blood flow through the arteries that supply blood to the base of the brain (vertebrobasilar insufficiency).
Less common causes of vertigo include:
- A noncancerous growth in the space behind the eardrum (cholesteatoma).
- Brain tumors and cancer that has traveled from another part of the body (metastatic).
Immediate medical attention is needed if vertigo occurs suddenly with Reference loss of function. Vertigo that occurs with loss of function in one area of the body can mean a problem in the brain, such as a Reference stroke Opens New Window or Reference transient ischemic attack (TIA) Opens New Window.
Alcohol and many prescription and nonprescription medicines can cause lightheadedness or vertigo. These problems may develop from:
- Taking too much of a medicine (overmedicating).
- Alcohol and medicine interactions. This is a problem, especially for older adults, who may take many medicines at the same time.
- Misusing or abusing a medicine or alcohol.
- Drug intoxication or the effects of withdrawal.
Reference Check your symptoms to decide if and when you should see a doctor.
|By:||Reference Healthwise Staff||Last Revised: Reference January 12, 2011|
|Medical Review:||Reference William H. Blahd, Jr., MD, FACEP - Emergency Medicine
Reference H. Michael O'Connor, MD - Emergency Medicine