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.
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
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
has many causes, including:
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
digestive tract 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 (arrhythmia),
which can cause fainting spells (syncope). Unexplained fainting spells need to
be evaluated by a doctor. You can check your heart rate by taking your pulse.
Many prescription and nonprescription
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.
Common causes of vertigo include:
Less common causes of vertigo include:
Immediate medical attention is needed if vertigo occurs
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
transient ischemic attack (TIA).
Alcohol and many prescription and nonprescription
medicines can cause lightheadedness or vertigo. These problems may develop
Check your symptoms to decide if and when you
should see a doctor.
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Lightheadedness usually is not a cause for concern unless it
is severe, does not go away, or occurs with other symptoms such as an irregular
heartbeat or fainting. Lightheadedness can lead to falls and other injuries.
Protect yourself from injury if you feel lightheaded:
If you have vertigo:
Call your doctor if any of the following occur during home
You may be able to prevent lightheadedness
orthostatic hypotension by taking your time.
In most cases, vertigo cannot be prevented. But some cases of
vertigo are caused by head injuries. Taking the following safety measures can
help lower your risk of getting a head injury that might lead to
When you are dizzy, your risk of falling increases. You can
make changes in your home to reduce your risk of falls.
For more information about falls, see the topic Preventing Falls.
To prepare for your appointment, see the topic Making the Most of Your Appointment.
You can help your
doctor diagnose and treat your condition by being prepared to answer the
Before seeing your doctor, it may be helpful to keep track of
your symptoms. Use the questions above as a guide for what to include in your
diary of symptoms(What is a PDF document?).
January 12, 2011
William H. Blahd, Jr., MD, FACEP - Emergency Medicine & H. Michael O'Connor, MD - Emergency Medicine
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