Tontura

What is dizziness?

Dizziness is a term used to describe a range of sensations, such as feeling faint, weak or unsteady. People use "feeling dizzy" to mean different things. It's usually used to describe one of the following sensations:

• Vertigem, which is a feeling of spinning around, or feeling like everything is spinning around you.

• Feeling faint or light-headed, as if about to pass out or collapse.

• Loss of normal balance, ie being unsteady but without feeling faint or whirly.

Sometimes, people have a symptom of 'dizziness' that doesn't clearly fit into any of these categories, which can be difficult to diagnose.

Vertigo, feeling faint or light-headed, and feeling unsteady all have very different causes, which is why healthcare professionals try to work out which of these symptoms people are feeling when they describe 'dizziness'.

If you feel faint or light-headed, then conditions originating anywhere in your body may be the cause. For example:

• Tendo um febre (temperatura alta).

• Very hot weather.

• Side-effects of certain medicines.

• Ataques de pânico and anxiety.

• Problems with your heart rate - for example, your heart going too fast, too slow or not regularly.

• Low iron levels (and other causes of anaemia).

• A drop in your blood pressure when you stand up (orthostatic hypotension).

• Postural orthostatic tachycardia syndrome (POTS).

• Enjoo de movimento.

• Níveis baixos de açúcar no sangue.

If you have vertigo, ie you feel as if you or the world around you is spinning or moving, then the most common causes are inner ear problems.

Other causes of vertigo include:

• Inner ear infections, such as labyrinthitis or vestibular neuritis.

• Vertigem posicional paroxística benigna (VPPB), a condition where certain movements of your head set off a spinning sensation.

• Doença de Ménière.

• Enxaqueca.

• Certain types of derrame.

Feeling unsteady ('disequilibrium') can have many different causes, such as:

• Ageing. Older people often develop problems with their balance, which is usually due to a combination of different problems, like those listed below.

• Inner ear problems, such as labyrinthitis or vestibular neuritis.

• Head injuries.

• Some medications, particularly ones that cause drowsiness.

• Alcohol use.

• Problems affecting the brain, such as a derrame, ou esclerose múltipla.

The following things are common causes of feeling lightheaded, or like you're about to faint.

Hipotensão ortostática

This means your blood pressure drops when you sit up from lying, or when you stand up from sitting or lying, in particular if you jump up out of bed after a night's sleep.

This causes people to feel light-headed and as if they are about to faint or collapse after standing up. Sometimes, people go on to faint and lose consciousness briefly.

The fall in blood pressure is just for a short time as the blood pressure quickly adjusts to your new posture. However, in some people the fainting feeling can be more severe and last for a few minutes.

This problem tends to get more troublesome as you become older. It has also been associated with long COVID.

Anemia

Symptom of anemia include tiredness and shortness of breath. However, if you have anaemia you may not get sufficient oxygen to the brain. This can make you feel light-headed.

Arrhythmias and other heart problems

An arrhythmia is an abnormal heart rhythm. It occurs when the heart may suddenly beat too fast, too slowly, or in an abnormal way. There are various causes.

One of the symptoms of an arrhythmia is to feel faint or light-headed as there may be a sudden decrease in blood supply to the brain as the arrhythmia develops. See the separate leaflet called Abnormal heart rhythms (Arrhythmias) for more details.

Various other heart disorders may cause a reduced flow of blood to the brain and cause you to feel faint or light-headed.

Ansiedade

In particular, if you have ansiedade com ataques de pânico you can feel light-headed. This can get worse if you over-breathe (hyperventilate) due to the anxiety or panic attack.

Medicação

Feeling faint and/or light-headed is sometimes a side-effect of some medicines. It is always worth reading the information leaflet that comes in the drug packet to check if dizziness is a recognised side-effect.

And if you mean the type of dizziness where you don't feel you or the room are spinning and you don't feel faint, but you just feel unbalanced, then there are yet more possible causes.

These also can start from problems of various body organs and systems, such as your ear, your brain, your nervous system and your general state of health. Alcohol, drogas ilícitas and various medicines can also make you feel off-balance, and affect different people differently.

If you are getting recurring dizzy spells, or a constant dizziness for which there is no obvious cause, then see your doctor. If you have dizziness with other alarming symptoms (such as sudden weakness in your arms, legs or face muscles, or chest pain or feeling very breathless), then call an ambulance or consult a doctor urgently.

The complications will depend on the type of dizziness and the cause.

Dizziness can sometimes cause people to fall and injure themselves. This is a particular problem in older people.

It is usually best to have an explanation for dizziness. If you have a prolonged episode of dizziness, or recurring episodes of dizziness and are not sure what is causing them, then it is wise to contact a doctor. In particular, if you have other symptoms in addition to the dizziness, such as:

• Headache, especially if it is severe, or a different kind of headache to ones you usually get.

• Hearing or visual loss.

• Problems with speech.

• Weakness of arms or legs.

• Dificuldade para caminhar.

• Collapse, or periods of unconsciousness.

• Numbness in areas of your body.

• Dor no peito.

• An abnormally slow or fast pulse.

• An irregular pulse.

• Any other symptom that you cannot explain.

If any of these symptoms have come on suddenly, contact a doctor immediately. Dizziness associated with a loss of consciousness that occurs during exercise needs urgent medical attention.

A doctor is likely to examine you. Sometimes the doctor can tell you the cause of the dizziness from your symptoms and the result of the examination.

In some cases, various tests may be organised to find the cause of the dizziness. These might include:

• Taking your temperature.

• Examining your ear.

• Examining your eyes and their movements.

• Checking your pulse and blood pressure.

• Checking your balance and co-ordination.

• Looking for any weakness in the muscles of your arms, legs or face.

• Tests which look for dizziness in certain positions or position changes.

Depending on what has been established from the above, further tests might be relevant. These will differ depending on which diagnosis is suspected, but might include:

• Um hearing test.

• Um exame de sangue - for example, to test you for anaemia.

• Um exame de ressonância magnética (RM) ou uma tomografia computadorizada (TC).

• Specialist tests for inner ear function and balance.

• Heart tests: a rastreamento cardíaco (eletrocardiograma, ou ECG), uma heart ultrasound scan (echocardiogram) or a heart monitor.

The treatment depends on the cause. Your doctor will be able to advise you regarding this. It will entirely depend on the type of dizziness and what has caused it. For example:

• Labyrinthitis usually improves on its own over time.

• Benign paroxysmal positional vertigo (BPPV) can be cured by a series of manoeuvres involving tilting your head in certain ways to move debris in the semicircular canals of the inner ear. You can do these at home - an example is in the further reading section of this leaflet.

• Dizziness caused by a problem with the heart rhythm or rate is treated by putting the heart rate right - for example, by medicines, a pacemaker or a procedure done directly on the heart.

• Dizziness caused by medication is usually easily solved by reducing the dose of, changing or stopping the medicine in question.

• Dizziness due to panic attacks or anxiety is solved by treating these conditions directly with talking treatments or medicines. Examples of possible treatments include terapia cognitivo-comportamental, beta-blocker medicines or antidepressant medicines.

Medicina

Sometimes you need a medicine for the symptom of dizziness. This might be while you wait for it to get better (for example, labyrinthitis) or while you are waiting for tests to find out the cause, or because you have a condition which can't easily be cured.

For the vertigo type of dizziness, tablets called proclorperazina ou cinarizina are often prescribed. These do not cure the underlying problem but they help you feel better until it goes away. These do not work so well for the light-headed/faint type of dizziness or for loss of balance.

Staying well hydrated and not leaving too long between meals can help prevent some types of light-headedness, but as dizziness has so many different meanings and causes, it isn't correct to say that it can always be prevented.

In this type of dizziness you do not have vertigo and are not light-headed or feeling faint. However, you feel unsteady on your feet and feel as if you may fall over when you walk, due to unsteadiness.

Your brain constantly receives nerve messages from various parts of the body to tell you where you are and what position you are in. The three main sources of these nerve messages are:

• Your eyes - what you look at helps your brain to tell what position you are in and how you are moving.

• Nerve messages from your skin, muscles and joints help your brain to tell the positions of your arms, legs and other parts of your body.

• Your inner ears. The inner ear includes the cochlea, vestibule and the labyrinth. The cochlea is concerned with hearing. The three semicircular canals help to control balance and posture. Head movements are sensed because when moving your head, the fluid in the labyrinth within the semicircular canals moves too. The movement of the fluid moves tiny fine hairs that are on the inside lining of the labyrinth. When the hairs move, this triggers messages to be sent to the brain via a nerve called the vestibular nerve. This gives the brain information about the movement and position of your head, even when your eyes are closed.

Corte transversal da orelha

Diagrama do ouvido interno

To be free of dizziness and to have good balance, it is best to have all of these (eyes, nerve signals from the skin muscles and joints, and inner ears) working normally.

This can be caused by various conditions. These include the following.

Ear problems

Some inner ear conditions can cause balance problems without the spinning sensation of vertigo - for example, an inner ear injury.

Nerve disorders

Various disorders which cause the nerves in the legs not to work properly can cause unsteadiness. For example, neuropatia periférica, esclerose múltipla, etc.

Brain disorders

Various problems in the brain, such as a derrame, ou um tumor cerebral, can cause balance problems. These occur if the affected part of the brain is a part that helps to control posture and balance. There will usually be other symptoms too.

General frailty

General frailty and/or being seriously ill with another illness may lead to loss of balance. You will usually have other symptoms in addition to problems with balance.

Alcohol and drugs

Your balance can be affected by drinking too much alcohol or taking some drogas ilícitas.