If you feel faint with low blood pressure, sit or lie down straight away and, if you can do so safely, raise your feet. Drink water if you are fully awake and can swallow, especially if dehydration may be involved. Stand up slowly once you feel better. Repeated episodes, actual fainting, or symptoms such as chest pain or breathlessness need prompt medical assessment; seek emergency help for serious warning signs.
Feeling faint can be unsettling, particularly when it happens after standing up, during hot weather, or after an illness. Several practical steps may help, but the most useful approach depends on why blood pressure is low. Dehydration, medication effects, prolonged standing, and certain medical conditions can contribute. Knowing what to do during an episode and when to seek medical care can help reduce the risk of falls and other complications.
What should you do immediately when you feel faint?
The first priority is to prevent a fall. Stop walking or standing as soon as you notice lightheadedness, weakness, blurred vision, or a feeling that you might pass out.
- Sit or lie down. If possible, lie flat and raise your feet above heart level, provided doing so is comfortable and there is no suspected injury that would make this unsafe.
- Stay in a safe position. Remain seated or lying down until the symptoms have passed. Avoid trying to walk to another room or standing up to test whether you feel better.
- Loosen tight clothing and cool down. Move away from excessive heat and loosen clothing around your neck if it feels restrictive.
- Drink water if you are fully alert. If you can swallow normally and dehydration may be contributing, water may help. Do not give drinks to someone who is unconscious, very drowsy, or unable to swallow safely.
- Get up gradually. When you feel better, move from lying to sitting, pause, and then stand slowly with support nearby.
MedlinePlus advises sitting or lying down and raising the feet when symptoms occur because of low blood pressure. If symptoms do not improve, keep returning, or become more concerning, seek medical help rather than relying on these steps alone.
What helps prevent low blood pressure and faintness?
For people who experience symptoms when standing or changing position, everyday adjustments may reduce episodes. These measures are most helpful when matched to the underlying cause and any other health conditions.
Drink enough fluids
Not drinking enough fluid can reduce the amount of blood circulating in the body and contribute to low blood pressure. Regularly drinking water may help prevent dehydration, particularly during hot weather, after sweating, or when recovering from vomiting or diarrhea. Fluid needs vary with activity, climate, and health status. People who have been told to restrict fluids because of heart or kidney problems should follow their healthcare professional's instructions rather than increasing their intake independently.
Change positions slowly
Blood pressure can fall briefly when someone moves from lying or sitting to standing. This is known as orthostatic, or postural, hypotension. Moving in stages gives the body time to adjust. Sit on the edge of the bed before standing, use a stable support if needed, and avoid sudden changes in posture. If symptoms repeatedly occur when standing, arrange an assessment instead of assuming that moving slowly will solve the problem.
Avoid prolonged standing and excessive heat
Standing in one place for a long time can contribute to faintness in some people. Hot environments may also make symptoms more likely, particularly when combined with sweating or dehydration. Take breaks, sit down when possible, and move to a cooler place if you begin to feel unwell. If you know that a particular activity has triggered previous episodes, discuss practical ways to reduce that exposure with a healthcare professional.
Consider smaller, more frequent meals
Some people experience a drop in blood pressure after eating, a pattern that can be more common in older adults. Smaller, more frequent meals may help in these circumstances. If faintness repeatedly follows meals, keep track of the timing and discuss it with a healthcare professional. Meal adjustments should complement an assessment of the symptoms rather than replace it.
Ask whether compression stockings may help
Compression stockings apply pressure to the legs and may reduce the pooling of blood there. This can help some people who experience postural hypotension. They are not necessary for everyone, and the appropriate type depends on the person's health and symptoms. A healthcare professional can advise whether stockings are suitable and how to use them.
These self-care approaches are consistent with guidance from Mayo Clinic on orthostatic hypotension treatment, which also advises reviewing fluid intake, alcohol use, meal patterns, and how quickly a person stands up.
Should you eat more salt to raise low blood pressure?
Increasing salt intake can raise blood pressure, so a healthcare professional may recommend it for certain people with symptomatic low blood pressure. However, adding salt to every meal or using salt supplements is not a safe solution for everyone. Too much sodium can create health risks, particularly for people with heart failure and some other medical conditions.
Before making a major dietary change, ask whether increasing salt is appropriate for you. A clinician can consider your blood pressure pattern, medications, kidney and heart health, and other factors when deciding whether this approach is suitable. Drinking excessive amounts of water or taking supplements intended to raise blood pressure should also not be used as a substitute for individualized guidance.
Mayo Clinic's guidance on low blood pressure treatment notes that more salt may help some people but should be discussed with a healthcare professional because excessive sodium can cause harm.
Could medication be causing your symptoms?
Some medicines can contribute to low blood pressure or make it more noticeable when standing. These include certain medicines used to treat high blood pressure, heart conditions, and other health problems. Alcohol and some other substances can also affect blood pressure. The timing of symptoms in relation to a new medicine, a dose change, or taking a medicine at a particular time may be useful information for your clinician.
Do not stop a prescribed medicine, skip doses, or change the dose on your own. A healthcare professional can review all your prescription medicines, over-the-counter products, and supplements to determine whether an adjustment is appropriate. Sometimes treating the underlying cause or changing a medicine is more useful than trying to raise blood pressure directly.
When does low blood pressure need medical attention?
A low blood pressure reading does not always mean there is a problem. In adults, low blood pressure is often described as a reading below 90/60 mmHg, but what matters also depends on a person's usual readings, symptoms, and medical history. Some people naturally have lower readings without feeling unwell. A single measurement cannot establish why someone feels faint.
Arrange a medical assessment if dizziness or faintness keeps returning, happens during everyday activities, is getting worse, or interferes with work, walking, or other usual routines. Seek prompt assessment after an actual fainting episode, particularly if it has never happened before or is accompanied by new symptoms. Repeated fainting deserves evaluation even when the person recovers quickly.
Seek emergency medical help if fainting or low blood pressure occurs with chest pain, difficulty breathing, a pounding or irregular heartbeat, new trouble speaking or moving, significant bleeding, or an injury from a fall. Emergency help is also needed if someone remains unconscious, does not become alert promptly, or is not breathing normally. Do not give an unconscious person food or drink.
MedlinePlus guidance on fainting identifies chest discomfort, an irregular heartbeat, neurological symptoms, significant injury, and delayed recovery as reasons to seek emergency help. When another person has fainted, check whether they are responsive and breathing, and call the local emergency number when indicated.
How can a healthcare professional find the cause?
An assessment may include questions about when symptoms started, whether they happen after standing or eating, recent illness, fluid intake, and all medicines being taken. The clinician may also ask about bleeding, heart symptoms, and previous episodes. These details help distinguish a temporary problem from one that needs more investigation.
Blood pressure and pulse may be checked in different positions, such as lying down and standing. Depending on the findings, tests may include blood tests or an electrocardiogram (ECG), which records the heart's electrical activity. Other tests may be considered when symptoms or examination findings point to a specific cause. Not everyone needs every test.
Treatment depends on what is contributing to the low blood pressure. It may involve improving hydration when appropriate, adjusting a medicine under medical supervision, managing an underlying illness, or using specific treatment for persistent postural hypotension. Medicines designed to raise blood pressure are sometimes needed, but they are not the first choice for every person with a low reading.
What is the safest long-term approach?
When low blood pressure makes you feel faint, sit or lie down immediately and avoid standing until the symptoms settle. Adequate fluids when medically appropriate, gradual position changes, avoiding prolonged standing in triggering situations, and reviewing medicines with a clinician may help prevent further episodes. Increasing salt or starting treatment to raise blood pressure should be done only with appropriate guidance.
Persistent symptoms or actual fainting should not be managed through home measures alone. A healthcare professional can assess the pattern, check for possible causes, and recommend measures suited to your health and circumstances.