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Medically reviewed guide · Last updated: 1 September 2026 · Reading time: approx. 10 min
Lightheadedness: Woozy Without the Room Spinning — Circulation, Medicines or the Mind?
At a glance
Lightheadedness is not vertigoyour head feels empty, woolly or "as if drunk", and when you stand up your vision may briefly go black — but nothing spins. That usually points to the circulation, metabolism or medicines, and less often to the inner ear.
The most common trigger when standing upis a drop in blood pressure (orthostatic hypotension), made worse by heat, not drinking enough, alcohol and blood pressure medicines.
Medicines are one of the most common and most avoidable reasonsblood pressure medicines, water tablets and prostate medicines, sleeping pills and sedatives, antidepressants, pregabalin and opioids — especially when several are combined and in older age, when lightheadedness leads to falls.
Other important causeslow blood sugar with insulin or sulfonylureas, anaemia, heart rhythm disorders, anxiety with breathing too fast, and chronic lack of sleep.
Get it checked immediatelylightheadedness with chest pain, shortness of breath, a racing heart or a brief loss of consciousness, sudden double vision, difficulty speaking or paralysis — call 112 (emergency number in Germany).
The most common causes compared
Cause
When it occurs
Typical accompanying signs
First step
Drop in blood pressure on standing
Seconds to three minutes after standing up, after large meals, in the heat
Vision going black, weak knees, rushing in the ears; better when lying down
Stand up slowly, drink; standing test with blood pressure measurement
Blood pressure medicines, water tablets and prostate medicines
After starting treatment or increasing the dose, often a few hours after taking them
Low readings in your log; diarrhoea or heat make it worse
Keep a blood pressure log, discuss with your practice
Sleeping pills, sedatives and painkillers
In the morning after taking them the evening before, after a dose increase
Tiredness, slowed thinking, unsteady walking
Have your medicines reviewed, no alcohol with them
Low blood sugar
With insulin or sulfonylureas, after exercise or a missed meal
In everyday language, "dizziness" covers very different sensations. If your surroundings are spinning, there is usually a problem with the balance organ — that is covered in the articles on dizziness and balance disorders. This article is about the other feeling: lightheaded, empty-headed, "as if wrapped in cotton wool", sometimes with the sense that you are about to keel over. Doctors call this lightheadedness or, when fainting is imminent, presyncope. How medicines in general can trigger dizziness is described in the complementary guide Dizziness from medications.
When your circulation dips: orthostatic hypotension
When you stand up, some of your blood pools in your legs and abdomen. Normally the body compensates within seconds by narrowing the blood vessels and making the heart beat faster. If that does not work, blood pressure falls and the brain briefly gets too little blood: your vision goes black, your knees go weak and there is a rushing sound in your ears. Doctors speak of orthostatic hypotension when, within three minutes of standing, the upper (systolic) reading falls by at least 20 mmHg or the lower (diastolic) reading by at least 10 mmHg.
This is made more likely by a lack of fluids in the heat or with diarrhoea or fever, by alcohol, long periods of bed rest, older age and conditions that damage the nerves controlling the circulation, such as long-standing diabetes or Parkinson's disease. Older people often experience the drop after a large meal (postprandial hypotension). In young people, it is sometimes not the blood pressure that falls but the pulse that rises sharply on standing — a sign of postural tachycardia syndrome (POTS), which can also appear after infections. More on persistently low readings in the article on low blood pressure; if you actually pass out, the article on fainting will help.
Medicines: the most common avoidable reason
If lightheadedness appears after a new medicine or an increase in dose, a link is likely. Two mechanisms dominate: active substances that lower blood pressure intensify the drop on standing, and sedating active substances slow the brain down. The two add up when several medicines come together — typically in older people with long medication plans. Which active substances are particularly likely to be involved is set out below in the medication section.
Low blood sugar
If you take insulin or sulfonylureas such as glimepiride, you can develop low blood sugar (hypoglycaemia) — after exercise, a missed meal, alcohol or too high a dose. As a rule, a reading below 70 mg/dl (3.9 mmol/l) counts as low blood sugar. The first signs are sweating, trembling, palpitations and ravenous hunger, followed by lightheadedness, poor concentration and confusion. Beta blockers can dampen trembling and palpitations, so that the warning signs are missing. People who do not take diabetes medicines rarely experience true hypoglycaemia; the queasy feeling after a long fast usually has other causes.
Heart and blood: too little oxygen reaching the head
If the heart pumps too slowly, too fast or irregularly, blood flow to the brain decreases. Sudden attacks of lightheadedness with a racing heart or skipped beats can point to rhythm disorders such as atrial fibrillation, and a very slow pulse to conduction disorders or too high a dose of beta blockers. In older people, lightheadedness on exertion, with breathlessness or chest tightness, can point to a narrowed heart valve (aortic stenosis). Anaemia shows itself through pallor, tiredness and lightheadedness, especially on exertion.
Anxiety, stress and hyperventilation
During anxiety and panic, many people breathe too fast without noticing. This lowers the carbon dioxide level in the blood, the blood vessels in the brain narrow slightly, and lightheadedness develops, with tingling around the mouth and in the hands, a tight chest and the feeling of standing "beside yourself" or "behind glass". In panic disorder, this can be so frightening that it triggers new anxiety in itself.
If non-specific lightheadedness or unsteadiness persists on most days for more than three months, worse when standing, when moving and in visually busy surroundings such as a supermarket or when scrolling, persistent postural-perceptual dizziness (PPPD) may be the cause. It often develops after an acute episode of vertigo, a panic attack or concussion, and it responds well to treatment — with balance training, behavioural therapy and medication if needed.
Sleep, infections, alcohol and salt balance
Too little or poor sleep, untreated sleep apnoea, fever, lack of fluids and the day after alcohol or cannabis often leave you lightheaded. In older people, a low sodium level in the blood (hyponatraemia) is an underestimated cause: it shows itself through lightheadedness, confusion and falls, and is often encouraged by water tablets or certain antidepressants — a simple blood test will clarify it. After a viral infection, including COVID-19, some people report weeks of lightheadedness and problems concentrating.
Rare but serious: stroke and heart attack
A stroke in the posterior circulation of the brain can begin with sudden dizziness or lightheadedness — usually together with double vision, slurred speech, difficulty swallowing, unsteady walking or weakness on one side. And lightheadedness with chest pressure, shortness of breath or a cold sweat can be a heart attack. In both cases, every minute counts.
Self-tests: first clues at home
These tests do not replace a diagnosis. Only do them when you are feeling well, and only do the standing test with a second person nearby.
Sorting it out: is something spinning (rotational vertigo), are you swaying as if on a boat (swaying dizziness), or does your head go empty and your vision go black (lightheadedness)? Only the last of these is the subject of this article.
The standing test (simplified Schellong test): lie quietly for five to ten minutes, measure your blood pressure and pulse, then stand up and measure again after one minute and after three minutes. If the upper reading falls by 20 mmHg or more, or the lower by 10 mmHg or more, that points to orthostatic hypotension. If only the pulse rises, by 30 beats or more, that may fit with POTS. If your vision goes black: sit or lie down immediately.
The dosing log: for a week, note down when you take which tablet and when the lightheadedness comes on. If it clusters a few hours after a particular dose, that is an important clue for your practice.
The sugar check: if you have a meter, measure during the symptoms. Readings below 70 mg/dl (3.9 mmol/l) suggest low blood sugar.
The pulse check: count your pulse for one minute. If at rest it is persistently below about 50, very high or clearly irregular, it needs to be seen at the practice.
The breathing check: if the lightheadedness comes with tingling around the mouth, breathe slowly and deliberately: four seconds in, six seconds out. If it improves within a few minutes, hyperventilation is likely. Breathing into a paper bag is no longer recommended.
Warning signs: when not to wait
Lightheadedness with chest pain, chest tightness, shortness of breath or a cold sweat
A brief loss of consciousness, especially on exertion, while lying down, without warning or with an injury
A persistent racing heart or a very slow pulse together with lightheadedness
Low blood sugar with confusion that does not improve quickly after glucose
Black, tarry stools, vomiting blood or heavy bleeding with pallor and lightheadedness
Repeated falls, or lightheadedness after a head injury
Lightheaded with chest pain, a racing heart or neurological deficits: 112 Lightheadedness together with chest pressure, shortness of breath or a cold sweat can point to a heart attack, and with double vision, difficulty speaking or paralysis to a stroke. Losing consciousness during exertion is also an emergency. Call 112 (emergency number in Germany), even if things improve for a short while.
Severe low blood sugar: nothing by mouth if swallowing is not safe If someone with diabetes is confused or barely responsive, only give them glucose or a sugary drink if they can swallow safely. If that is not the case or they lose consciousness: recovery position, emergency glucagon if available, and call 112 immediately.
The real risk is falling In older people, lightheadedness often leads to falls and broken bones. If you are repeatedly lightheaded or have already had a fall, see your practice promptly and bring your complete medication list with you.
The treatment pathway: step by step
Acute: get down and put your legs up. Sit or lie down immediately, ideally with your legs raised. If you feel warning signs coming on, counter-manoeuvres help: cross your legs and tense them firmly, clench your fists, pull your arms against each other.
Adjust your daily routine. Get up in stages, drink enough unless you have been told to limit your fluid intake, eat smaller meals, drink little alcohol. Compression stockings can help. More salt only after checking with your practice — it is unsuitable if you have high blood pressure or heart failure.
Assessment at the GP practice. Blood pressure lying down and standing, ECG, blood count, blood sugar, sodium, kidney values and, if needed, thyroid — and a structured review of all your medicines, including over-the-counter ones. A medication review at the pharmacy can complement this.
Adjust the medicines. This is often where the biggest lever lies: the practice can change the dose, the time of taking or the active substance, or stop a medicine you can do without. The decision always lies with the practice treating you.
Further tests. Long-term ECG and 24-hour blood pressure monitoring, a heart ultrasound, and a tilt-table test for unexplained attacks; neurology or ENT if there turns out to be a balance disorder after all; psychosomatic medicine or behavioural therapy for anxiety and PPPD.
An honest assessment Over-the-counter "circulation remedies" and ginkgo products for lightheadedness have only weak evidence behind them. Betahistine is intended for Ménière's disease and makes no sense for lightheadedness without an inner-ear cause. In severe orthostatic hypotension, the practice may consider prescription medicines such as midodrine — but adjusting medicines, drinking enough and counter-manoeuvres usually work more reliably.
The medication angle: blood pressure medicines, sedatives and more
Lightheadedness is one of the most common side effects of all. The following groups are involved particularly often.
Blood pressure medicines and water tablets
Any blood pressure medicine can make you lightheaded, especially at the start, after dose increases, in the heat, and with diarrhoea and vomiting. ACE inhibitors such as ramipril and sartans (angiotensin receptor blockers) can lower blood pressure sharply, especially with the first dose and above all in combination with water tablets. Water tablets in turn remove fluid and salt from the body, which in older people can lead to hyponatraemia. Beta blockers slow the pulse, while alpha blockers such as doxazosin and prostate medicines such as tamsulosin encourage the drop in blood pressure on standing. Nitrates and erectile dysfunction medicines must never be combined. Ask your practice in advance how to handle water tablets and blood pressure medicines if you have diarrhoea or a fever.
Sleeping pills and sedatives
Benzodiazepines such as lorazepam or diazepam and Z-drugs such as zolpidem can still have an effect the next day: lightheadedness, slowed reactions, unsteady walking. Alcohol makes this considerably worse. Over-the-counter sleeping aids containing diphenhydramine or doxylamine also have anticholinergic effects and, according to the PRISCUS list (the German list of potentially inappropriate medicines for older people), are unsuitable for older people. After taking benzodiazepines for a longer period, you must not stop them abruptly. Alternatives are described in the guide Alternatives to sedatives.
Antidepressants, antipsychotics, medicines for nerve pain
Tricyclic antidepressants such as amitriptyline, as well as mirtazapine and quetiapine, cause tiredness and lower blood pressure on standing. SSRIs can cause lightheadedness at the start and when stopped too quickly, and in older people they can lower the sodium level. With pregabalin and gabapentin, lightheadedness and drowsiness are among the very common side effects, especially while the dose is being increased.
Opioids such as tramadol or tilidine cause lightheadedness especially at the start. Muscle relaxants and anticholinergic bladder medicines can trigger lightheadedness and confusion in older people. Insulin and sulfonylureas cause low blood sugar, and SGLT2 inhibitors such as empagliflozin can lower blood pressure through fluid loss, especially together with water tablets.
Over-the-counter painkillers
Ibuprofen and other anti-inflammatory painkillers rarely cause lightheadedness themselves, but they weaken the effect of blood pressure medicines and, together with ACE inhibitors or sartans and water tablets, put a strain on the kidneys. Without medical advice, the package leaflet usually says: no longer than three to four days in a row.
Many medicines, one risk
With every additional sedating or blood pressure-lowering medicine, the risk of falling rises. The PRISCUS 2.0 list names active substances that are particularly unfavourable for older people. That is why any long-term medication in older age should be reviewed regularly.
Do not stop anything on your own Stopping beta blockers abruptly can trigger a racing heart and chest pain, stopping benzodiazepines can cause withdrawal symptoms up to and including seizures, and stopping antidepressants can cause discontinuation symptoms. Note down the timing and discuss it with your practice — often a small adjustment is enough.
Lightheaded in the morning — is it the evening tablet?
Dosing times and symptoms side by side show what memory blurs.
Get up in three stages — sit up first, move your legs, then stand up slowly. Especially at night and in the morning.
Drink enough — particularly in the heat and with fever or diarrhoea, unless you have been told to limit your fluid intake.
Smaller meals, little alcohol — large portions and alcohol lower blood pressure further.
Exercise — trained leg muscles pump blood back to the heart more effectively.
Have your medication plan reviewed regularly — at least once a year and after every hospital stay. If you take diabetes medicines: have a plan for low blood sugar.
Five tablets, three practices — who keeps track?
A medication plan that is complete and comes with you to every appointment.
With rotational vertigo, your surroundings spin, usually because of a disorder of the balance organ. Lightheadedness, on the other hand, feels empty, woolly or as if you are about to faint, without any sense of spinning. It more often has causes in the circulation, metabolism or medicines.
Yes, this is common — especially at the start, after a dose increase, in the heat or with diarrhoea, and in combination with water tablets. A blood pressure log with readings taken sitting and standing helps your practice adjust the dose, timing or active substance. Do not stop the tablets on your own initiative.
Many sleeping pills and sedatives work for longer than the night and leave a hangover effect with lightheadedness, slow reactions and unsteady walking. Alcohol and older age make this worse. Talk to your practice about the dose, the active substance or alternatives, and do not drive in this state.
Yes. During anxiety, many people breathe too fast without noticing, which causes lightheadedness, tingling around the mouth and a feeling of being behind glass. Breathing out slowly often improves this within a few minutes. If it happens often, it is worth having it assessed by a doctor or psychotherapist.
If chest pain, shortness of breath, a racing heart, a cold sweat, loss of consciousness, double vision, difficulty speaking or paralysis come on as well, it is an emergency: call 112. You should have repeated lightheadedness, falls, and lightheadedness after starting a new medicine assessed promptly.
Sit or lie down immediately and raise your legs. Crossing and tensing your legs or clenching your fists stabilises your blood pressure. If you take diabetes medicines, measure your blood sugar and, if it is low, take fast-acting carbohydrates.
DEGAM (German College of General Practitioners and Family Physicians): S3 guideline on acute dizziness in general practice (2018) — German source. Accessed 2026.
European Society of Cardiology (ESC): Guidelines for the diagnosis and management of syncope (2018). Accessed 2026.
PRISCUS 2.0: List of potentially inappropriate medications for older people (2023) — German source. Accessed 2026.
Gesundheitsinformation.de (IQWiG) and gesund.bund.de (German national health portal): Dizziness, low blood pressure and low blood sugar — German source. Accessed 2026.
MSD Manual, Consumer Version: Dizziness and vertigo, orthostatic hypotension, hypoglycaemia and hyponatraemia. Accessed 2026.
Summaries of product characteristics for the active substances mentioned (including ramipril, tamsulosin, zolpidem, pregabalin, empagliflozin). Accessed 2026.
This article is for general information and does not replace medical advice, diagnosis or treatment. The self-tests described — including the standing test — are a guide and not a diagnosis. If you have lightheadedness with chest pain, shortness of breath, a racing heart or loss of consciousness, sudden double vision, difficulty speaking or paralysis, or severe low blood sugar, please contact a doctor or the emergency services without delay.
