Lightheadedness in a patient include low blood pressure, high blood pressure, dehydration, medications, postural or orthostatic hypotension, diabetes, endocrine disorders, hyperventilation, heart conditions, and vasovagal syncope. Dizziness has many possible causes, including inner ear disturbance, motion sickness and medication effects. Dizziness:  inner ear disturbance, motion sickness and medication effects. 

Lightheadedness: Allergies, Illnesses such as the flu or colds, Vomiting, diarrhea, fevers,other illnesses that cause dehydration and also very deep or rapid breathing (hyperventilation).
Common causes of dizziness. The most common causes of dizziness are outlined below. 1  Labyrinthitis – an inner ear infection that affects your hearing and balance, and can lead to a severe form of dizziness called vertigo. 2  Migraine – dizziness may come on before or after the headache, or even without the headache.  Meniere's disease. This is an inner ear disorder thought to be caused by a buildup of fluid and changing pressure in the ear. It can cause episodes of vertigo along with ringing in the ears (tinnitus) and hearing loss. Vestibular neuritis or labyrinthitis. This is an inner ear problem usually related to infection (usually viral). Other causes of dizziness. 1  Neurological conditions. 2  Some neurological disorders — such as Parkinson's disease and multiple sclerosis — can lead to progressive loss of balance. 3  Medications. 4  Dizziness can be a side effect of certain medications — such as anti-seizure drugs, antidepressants, sedatives and tranquilizers. 1 Common causes of dizziness include inner-ear disorders, medications, and alcohol. Dizziness is often a result of vertigo. It can also be caused by a problem in the inner ear, where balance is regulated. The most common cause of vertigo and vertigo-related dizziness is benign paroxysmal positional vertigo (BPPV). This causes short-term dizziness when a person changes positions quickly—for instance, when sitting up in bed. Dizziness is not a disease but a symptom of other disorders. Vertigo and disequilibrium may cause a feeling of dizziness, but those two terms describe different symptoms. Vertigo is characterized by a feeling of spinning. Disequilibrium is a loss of balance or equilibrium. Dizziness has many possible causes, including inner ear disturbance, motion sickness and medication effects. Sometimes it's caused by an underlying health condition, such as poor circulation, infection or injury. The way dizziness makes you feel and your triggers provide clues for possible causes. 1 Neurological conditions. 2  Some neurological disorders — such as Parkinson's disease and multiple sclerosis — can lead to progressive loss of balance. 3  Medications. 4  Dizziness can be a side effect of certain medications — such as anti-seizure drugs, antidepressants, sedatives and tranquilizers. Lightheadedness has many causes, including: 1  Allergies. 2  Illnesses such as the flu or colds. 3  Home treatment of your flu and cold symptoms usually will relieve lightheadedness. 4  Vomiting, diarrhea, fevers, and other illnesses that cause dehydration. 5  Very deep or rapid breathing (hyperventilation). 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. Sometimes the cause of lightheadedness is an abnormal heart rhythm (arrhythmia), which can cause fainting spells (syncope). Causes of Vertigo. Vertigo is often caused by an inner ear problem. Some of the most common causes include: BPPV. These initials stand for benign paroxysmal positional vertigo. BPPV occurs when tiny calcium particles (canaliths) clump up in canals of the inner ear. This is an inner ear disorder thought to be caused by a buildup of fluid and changing pressure in the ear. It can cause episodes of vertigo along with ringing in the ears (tinnitus) and hearing loss. Vestibular neuritis or labyrinthitis. This is an inner ear problem usually related to infection (usually viral). 1 Anxiety disorders. 2  Certain anxiety disorders may cause lightheadedness or a woozy feeling often referred to as dizziness. 3  These include panic attacks and a fear of leaving home or being in large, open spaces (agoraphobia). 4  Low iron levels (anemia). 1 Neurological conditions. 2  Some neurological disorders — such as Parkinson's disease and multiple sclerosis — can lead to progressive loss of balance. 3  Medications. 4  Dizziness can be a side effect of certain medications — such as anti-seizure drugs, antidepressants, sedatives and tranquilizers. 1 Some of the conditions that may cause lightheadedness in a patient include low blood pressure, high blood pressure, dehydration, medications, postural or orthostatic hypotension, diabetes, endocrine disorders, hyperventilation, heart conditions, and vasovagal syncope. Lightheadedness is often caused by a decrease in blood supply to the brain, while vertigo may be caused by disturbances of the inner ear and the balance centers of the brain.
http://www.nhs.uk/Conditions/dizziness/Pages/Introduction.aspx http://www.webmd.com/brain/vertigo-symptoms-causes-treatment http://www.mayoclinic.org/diseases-conditions/dizziness/basics/causes/CON-20023004 http://www.healthline.com/symptom/dizziness http://www.mayoclinic.org/diseases-conditions/dizziness/basics/causes/CON-20023004 http://www.webmd.com/brain/tc/dizziness-lightheadedness-and-vertigo-topic-overview http://www.webmd.com/brain/vertigo-symptoms-causes-treatment http://www.mayoclinic.org/diseases-conditions/dizziness/basics/causes/CON-20023004 http://www.medicinenet.com/dizziness_dizzy/article.htm
what are some causes of dizziness and lightheadedness