Read below about fast heart rate in adults, including causes and common questions. Or get a personalized analysis of your fast heart rate in adults from our A.I. health assistant. At Buoy, we build tools that help you know what’s wrong right now and how to get the right care.

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A.I. Health Assistant Causes for Fast Heart Rate in Adults

The list below shows results from the use of our A.I. Health Assistant by Buoy users who experienced fast heart rate in adults. This list does not constitute medical advice.

  1. 1.Atrial Flutter

    Atrial fibrillation or flutter is a common type of abnormal heartbeat. The heart rhythm is fast and irregular in this condition.

    If the flutter only occurs once and there is no underlying heart disease, it is likely to never happen again.

    Rarity:
    Rare
    Top Symptoms:
    shortness of breath, racing heart beat, lightheadedness, deep chest pain, behind the breast bone, shortness of breath on exertion
    Urgency:
    In-person visit
  2. 2.Overactive Thyroid

    The thyroid is a butterfly-shaped gland in the neck, just above your collarbone. It is one of your endocrine glands, which make hormones. Thyroid glands control how fast one burns calories and how fast the heart beats. If the thyroid is too active, it makes more thyroid hormones than the body needs. This is called hyperthyroidism.

    Great prognosis with high remission rates

    Rarity:
    Uncommon
    Top Symptoms:
    fatigue, anxiety, depressed mood, irritability, trouble sleeping
    Urgency:
    Primary care doctor
  3. 3.Atrial Fibrillation

    An arrhythmia is a problem with the speed or rhythm of the heartbeat. The atria comprise two out of the four chambers of the heart. When their beat is disturbed, symptoms such as a racing heart, chest pain, breathlessness, and dizziness may occur.

    More than 1/2 of people with short term atrial fibrillation get their normal heart rhythm back in less than 2 days without any treatment.

    Rarity:
    Rare
    Top Symptoms:
    fatigue, chest pain, shortness of breath, racing heart beat, lightheadedness
    Urgency:
    Emergency medical service
  4. 4.Severe Asthma Attack

    A severe asthma attack makes it incredibly hard to breathe and is a medical emergency. If possible, use a rescue inhaler ASAP.

    Within minutes to hours of treatment

    Rarity:
    Common
    Top Symptoms:
    being severely ill, shortness of breath at rest, wheezing, irritability, cough with dry or watery sputum
    Symptoms that always occur with severe asthma attack:
    shortness of breath at rest, being severely ill
    Urgency:
    Hospital emergency room

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  5. 5.Iron Deficiency Anemia

    Anemia is a condition in which the body does not have enough healthy red blood cells, which deliver oxygen. Iron deficiency anemia occurs when the body does not have enough iron. Iron helps make red blood cells.

    Resolves with treatment

    Rarity:
    Common
    Top Symptoms:
    fatigue, headache, shortness of breath, dizziness, heavy menstrual flow
    Urgency:
    Primary care doctor
  6. 6.Long Qt Syndrome

    Long QT syndrome (LQTS) is a disorder of the heart's electrical activity. It can cause sudden, uncontrollable, dangerous arrhythmias in response to exercise or stress. Arrhythmias are problems with the rate or rhythm of the heartbeat.

    Resolves after stopping medication that causes it

    Rarity:
    Common
    Top Symptoms:
    racing heart beat, brief fainting episode, not having protected the body during the fall, feeling completely normal before fainting
    Urgency:
    Primary care doctor
  7. 7.Low Blood Cell Counts Due to a Chronic Disease

    Anemia is a condition in which the body does not have enough healthy red blood cells, which are cells that provide oxygen to body tissues. Anemia of chronic disease is anemia that is found in people who already have certain long-term (chronic) medical conditions.

    Long-term condition with a variable course, highly dependent on the underlying cause.

    Rarity:
    Common
    Top Symptoms:
    fatigue, shortness of breath on exertion, decreased exercise tolerance, dizziness when standing up, pale skin all over
    Urgency:
    Primary care doctor
  8. 8.Cardiac Tamponade

    Cardiac tamponade is pressure on the heart that occurs when blood or fluid builds up in the space between the heart muscle (myocardium) and the outer covering sac of the heart (pericardium).

    Indefinite

    Rarity:
    Rare
    Top Symptoms:
    being severely ill, fast heart rate in adults, fear of dying, restlessness
    Symptoms that always occur with cardiac tamponade:
    being severely ill
    Urgency:
    Emergency medical service
  9. 9.Wolff - Parkinson - White Syndrome

    Wolff-Parkinson-White syndrome is a heart condition in which there is an abnormal extra electrical pathway of the heart. The condition can lead to periods of rapid heart rate.

    Chronic but manageable

    Rarity:
    Rare
    Top Symptoms:
    racing heart beat, shortness of breath, deep chest pain, behind the breast bone, lightheadedness, irregular heart beat
    Urgency:
    Primary care doctor

Questions Your Doctor May Ask About Fast Heart Rate in Adults

  • Q.Have you been feeling more tired than usual, lethargic or fatigued despite sleeping a normal amount?
  • Q.Are you sweating more than usual?
  • Q.Have you felt excessively thirsty?
  • Q.Are you feeling irritable (easily made upset)?

If you've answered yes to one or more of these questions, try our fast heart rate in adults symptom checker to find out more.

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Fast Heart Rate in Adults Symptom Checker Statistics

  • People who have experienced fast heart rate in adults have also experienced:

    • 14% Racing Heart Beat
    • 5% Shortness of Breath
    • 5% Fatigue
  • People who have experienced fast heart rate in adults were most often matched with:

    • 46% Atrial Fibrillation
    • 33% Atrial Flutter
    • 20% Overactive Thyroid
  • Source: Aggregated and anonymized results from visits to the Buoy AI health assistant (check it out by clicking on “Take Quiz”).

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