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Why does my heart beat fast?
Heart palpitations are the sensation of being aware of your heartbeat.
It may feel like your heart is:
• beating fast
• pounding
• fluttering
• skipping beats
This can feel uncomfortable or alarming.
In many cases, palpitations are harmless and temporary.
What normally controls heart rhythm
Your heart beats automatically.
It is controlled by electrical signals that regulate heart rhythm.
These signals respond to the body's needs.
For example, your heart beats faster during:
• exercise
• stress
• fear
• illness
This is normal.
Common harmless causes of palpitations
Most palpitations are caused by normal body responses such as:
• stress or anxiety
• dehydration
• fatigue
• fever
• caffeine
• lack of sleep
These temporarily increase heart activity.
Once the cause resolves, the heart returns to normal.
Why dehydration causes fast heartbeat
Your heart helps circulate blood.
When dehydration reduces blood volume, the heart beats faster to maintain circulation.
This is a normal compensatory response.
Why anxiety causes fast heartbeat
Anxiety activates the body's stress response.
This releases adrenaline.
Adrenaline increases heart rate.
This prepares the body for action.
This response is temporary.
Medical causes of palpitations
Less commonly, palpitations may be caused by:
• anemia
• infection
• fever
• hormonal imbalance
• heart rhythm disorders
These require medical evaluation.
When palpitations are usually not dangerous
Palpitations are usually harmless if:
• brief
• occur occasionally
• resolve spontaneously
• occur during stress or illness
The heart naturally returns to normal rhythm.
When to seek medical care urgently
Seek medical care if palpitations occur with:
• chest pain
• fainting
• severe dizziness
• difficulty breathing
• persistent irregular heartbeat
These require medical evaluation.
Key message
Heart palpitations are often a normal response to stress, dehydration, or illness.
Understanding the cause helps reduce fear and supports calm decision-making.
Disclaimer
This article is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare professional if you have symptoms or concerns about your health.