A heart attack does not always begin with dramatic, crushing chest pain. Symptoms may be sudden and severe, but they can also start slowly, feel mild, come and go, or resemble indigestion, fatigue or muscle discomfort.

The most important warning sign is usually pain, pressure, squeezing, tightness or heaviness in the centre or left side of the chest. Other possible heart attack symptoms include pain spreading to the arm, shoulder, back, neck or jaw; shortness of breath; cold sweating; nausea; dizziness; unusual weakness or fatigue.

If you think you or someone near you may be having a heart attack, treat it as a medical emergency. Do not wait for the symptoms to become severe or disappear on their own.

In Kathmandu, Kathmandu Metropolitan City lists 102 for its free ambulance service. Nagarik Hospital also lists a 24-hour Emergency & Ambulance Service at +977-9801904640 and a valley ambulance service.

For Nagarik Hospital emergency information, see the 24-hour Emergency & Ambulance Service.

What Are the Main Symptoms of a Heart Attack?

The symptoms of a heart attack vary from person to person. Some people experience several symptoms at once, while others have only one or two.

Chest pressure, pain or discomfort

Chest discomfort is the most commonly recognized warning sign. It may feel like:

• pressure
• heaviness
• squeezing
• fullness
• tightness;
• aching or pain.

The discomfort is often felt in the centre or left side of the chest. It may last for several minutes or disappear and return.

Importantly, heart-attack discomfort does not always feel like extreme pain. NHLBI notes that symptoms may start slowly and can initially be mild.

Pain spreading beyond the chest

Heart-attack discomfort can spread to:

• one or both arms
• shoulders
• back
• neck
• jaw
• upper abdomen.

Someone experiencing jaw, arm or back discomfort along with breathlessness, sweating, nausea or chest pressure should not assume that the problem is muscular or digestive.

Shortness of breath

Breathlessness may occur together with chest discomfort, but it can also occur without obvious chest pain.

A person may suddenly feel unable to get enough air, unusually breathless after limited activity, or short of breath while resting. The CDC includes shortness of breath among the major symptoms of heart attack. CDC guidance on heart attack symptoms

Cold sweat, nausea or dizziness

Heart attacks can activate the body's stress response. Possible symptoms therefore include:

• sudden cold sweating
• nausea or vomiting
• light-headedness
• dizziness
• weakness or feeling faint.

These symptoms can easily be mistaken for food poisoning, dehydration, anxiety or a stomach problem. Their significance becomes particularly concerning when they occur with chest or upper-body discomfort.

Unusual tiredness

Some people experience unexplained weakness or fatigue before or during a heart attack. This symptom receives less attention than chest pain but can be important, particularly when it is new, severe or accompanied by breathlessness, nausea or upper-body discomfort.

Can You Have a Heart Attack Without Chest Pain?

Yes.

Although chest discomfort remains a common heart-attack symptom, a person can experience a heart attack without prominent chest pain.

NHLBI notes that symptoms differ among individuals, and very mild or “silent” heart attacks can occur. Older adults and people with diabetes or high blood sugar may be particularly likely to have subtle or silent symptoms.

That is why symptoms such as unexplained breathlessness, unusual fatigue, nausea, sweating, jaw discomfort or back pain should not automatically be dismissed simply because the chest does not hurt.

Are Heart Attack Symptoms Different in Women?

Women can experience the same classic symptoms as men, and chest pain or discomfort remains an important symptom in women.

However, women may also experience symptoms that are easier to misinterpret, such as:

• unusual fatigue or weakness
• shortness of breath
• nausea or stomach discomfort
• light-headedness
• pain in the back, arm, shoulder, neck or jaw.

The American Heart Association emphasizes that women should not wait for a stereotypical “crushing chest pain” presentation before seeking emergency help. American Heart Association guidance on heart attack symptoms in women

Symptoms alone cannot establish whether a heart attack has occurred. Any new combination of concerning symptoms deserves prompt medical assessment.

What Is a Silent Heart Attack?

A silent heart attack is a myocardial infarction that causes no obvious symptoms, very mild symptoms or symptoms that the person does not recognize as being heart-related.

Someone may interpret the episode as:

• indigestion
• tiredness
• a strained muscle
• mild breathlessness
• back or jaw discomfort.

Despite the word “silent,” heart muscle can still be damaged.

NHLBI states that silent heart attacks occur more often in older adults and people with diabetes or high blood sugar.

A previous silent heart attack may later be discovered through tests such as an ECG or cardiac imaging, depending on the clinical situation.

Heart Attack or Gas? Why It Can Be Difficult to Tell

Indigestion, acid reflux and a heart attack can sometimes produce discomfort in similar areas. A heart attack may even feel like heartburn or indigestion.

This means that there is no reliable home test that can safely prove that new chest discomfort is “just gas.”

Warning features that should raise concern include:

• pressure, heaviness or squeezing rather than a brief isolated sensation
• discomfort spreading to the arm, neck, jaw, shoulder or back
• shortness of breath
• sweating
• nausea
• dizziness or faintness
• symptoms triggered by exertion
• new symptoms in someone with diabetes, high blood pressure, high cholesterol, smoking history or established heart disease.

Even this pattern cannot diagnose a heart attack. Some heart attacks have atypical symptoms, and several other serious medical conditions can also cause chest pain.

For a broader discussion, read Nagarik Hospital's guide to chest pain causes and warning signs.

What Causes a Heart Attack?

A heart attack, medically called a myocardial infarction, occurs when part of the heart muscle loses its blood supply long enough to become injured.

The most common underlying condition is coronary artery disease.

Over many years, cholesterol and other material can accumulate inside the coronary arteries and form plaque. If a plaque ruptures, a blood clot can develop on its surface. A large enough clot may partly or completely block blood flow to the heart muscle. NHLBI explanation of heart attack causes and risk factors

Less commonly, heart attacks can occur through other mechanisms, including severe coronary artery spasm, a clot travelling into a coronary artery or spontaneous coronary artery dissection.

Who Is More Likely to Have a Heart Attack?

Risk increases when coronary artery disease and its contributing factors are present.

Important modifiable risk factors include:

• tobacco use
• high blood pressure
• high LDL or other abnormal blood lipids
• diabetes or persistently high blood sugar
• physical inactivity
• unhealthy dietary patterns
• overweight and obesity.

Age and family history can also influence cardiovascular risk and cannot be changed.

Having a risk factor does not mean that a person will definitely have a heart attack. Likewise, having no known risk factors does not make concerning symptoms safe to ignore.

Why Heart Attack Symptoms Should Never Be “Watched Overnight”

Heart muscle needs a continuous supply of oxygen-rich blood.

When an artery is severely blocked, delaying treatment allows more heart muscle to remain without adequate oxygen. WHO summarizes the principle simply: earlier recognition and emergency care improve the chance of survival and recovery. WHO heart att ack guidance

Do not wait to see whether severe or suspicious symptoms disappear by morning.

Likewise, do not drive yourself if a suitable ambulance or another safe transport option is available. A person's condition can worsen suddenly while travelling.

What Should You Do If You Suspect a Heart Attack?

First, stop physical activity and seek emergency medical help.

In Kathmandu, the Metropolitan City currently lists 102 for free ambulance assistance. Availability and emergency arrangements may differ elsewhere in Nepal.

Nagarik Hospital in Gatthaghar, Bhaktapur lists:

24-hour Emergency & Ambulance Service: +977-9801904640

The hospital also describes 24/7 ground ambulance emergency medical services for the valley.

Do not spend valuable time searching online for a diagnosis if symptoms strongly suggest a heart attack.

Do not take random heart medicines, blood thinners or another person's prescription. Emergency medication decisions depend on factors including allergies, bleeding risk, blood pressure, other illnesses and medicines already being taken.

If the person becomes unresponsive and is not breathing normally, the situation may have progressed to cardiac arrest and immediate resuscitation/emergency response is required.

Heart Attack vs Cardiac Arrest

A heart attack and cardiac arrest are related but different emergencies.

A heart attack is mainly a blood-flow problem: blood reaching part of the heart muscle becomes severely reduced or blocked.

Cardiac arrest is an electrical problem in which the heart suddenly stops pumping blood effectively. The person typically becomes unresponsive and is not breathing normally.

A heart attack can trigger cardiac arrest, but most heart attacks do not immediately result in cardiac arrest.

Both require urgent medical attention.

How Do Doctors Check for a Heart Attack?

Symptoms alone are not sufficient to confirm or exclude a heart attack.

When a person arrives at an emergency department with possible heart-attack symptoms, assessment commonly includes a medical history, physical examination and urgent investigations.

Electrocardiogram — ECG or EKG

An ECG records the electrical activity of the heart.

It can reveal changes associated with acute coronary syndrome and help clinicians determine whether urgent coronary treatment may be required.

Cardiac troponin blood test

Damaged heart-muscle cells release proteins including troponin into the bloodstream.

Blood troponin measurements therefore play a central role in determining whether heart-muscle injury has occurred. Testing may need to be repeated because levels can change over time. NHLBI guide to diagnosing a heart attack

Echocardiography and other imaging

An echocardiogram may be used to examine heart structure and pumping function.

Other investigations may be required depending on the clinical picture and alternative diagnoses.

Coronary angiography

Coronary angiography allows clinicians to identify narrowed or blocked coronary arteries.

When appropriate, the procedure may be followed immediately by an intervention to reopen the artery.

How Is a Heart Attack Treated?

The central goal of acute treatment is to restore adequate blood flow to the heart as quickly and safely as possible.

Treatment depends on factors including the type of heart attack, the artery involved, how long symptoms have been present and the person's overall condition.

Angioplasty and stenting

Percutaneous coronary intervention, commonly called PCI or angioplasty, uses a catheter to open a blocked coronary artery.

A stent may then be placed to help keep the artery open.

Medicines

Depending on the situation, hospital treatment may involve medicines that:

• reduce blood clot formation
• prevent platelets sticking together
• relieve certain symptoms
• control blood pressure or heart workload
• lower cholesterol
• dissolve a clot when rapid PCI is not available or appropriate.

Medication must be individualized by the treating team.

Coronary artery bypass surgery

Some people with extensive or complex coronary disease may require coronary artery bypass graft surgery, commonly called CABG.

The 2025 ACC/AHA acute coronary syndrome guideline emphasizes individualized antiplatelet, invasive and secondary-prevention strategies according to each patient's condition and bleeding and cardiovascular risk. 2025 ACC/AHA acute coronary syndrome guideline summary

Nagarik Hospital's website lists general/non-invasive cardiology and interventional cardiology through its Cardiology Department.

Can Heart Attacks Be Prevented?

Not every heart attack can be prevented, but many of the major risk factors for coronary artery disease can be reduced or treated.

Important long-term measures include:

• avoiding tobacco
• controlling blood pressure
• managing diabetes
• managing abnormal cholesterol
• being physically active as medically appropriate
• maintaining a healthy weight
• eating a balanced diet rich in vegetables, fruit and whole grains while limiting excessive salt and saturated fat
• taking prescribed medicines correctly.

WHO identifies tobacco use, unhealthy diet, physical inactivity, harmful alcohol use, raised blood pressure, raised blood glucose and abnormal blood lipids among major preventable cardiovascular risk factors.

For people without emergency symptoms who are worried about cardiovascular risk, a cardiology consultation can help determine which tests or preventive measures are appropriate.

Read more about when to see a cardiologist in Bhaktapur.

Heart Health in Nepal

Heart-attack prevention is particularly relevant in Nepal because several cardiovascular risk factors are common.

The latest Nepal STEPS survey currently listed by WHO is from 2019, so these figures should not be presented as 2026 prevalence. In that 2019 national survey of adults aged 15–69, 24.5% had raised blood pressure, while 17% were current smokers and 97% consumed fewer than five daily servings of fruit and vegetables.

These figures illustrate why prevention, early cardiovascular risk assessment and symptom awareness remain important, but they do not determine an individual person's risk.

When Should You See a Cardiologist Rather Than the Emergency Department?

A routine cardiology appointment can be appropriate for issues such as:

• cardiovascular risk assessment
• high blood pressure
• high cholesterol
• diabetes with cardiovascular risk
• recurring but non-acute symptoms already assessed by a clinician
• follow-up after abnormal heart tests
• long-term heart-disease management.

However, possible active heart-attack symptoms are not a routine appointment problem.

Sudden chest pressure, significant breathlessness, pain spreading to the arm or jaw, cold sweating, faintness or another concerning combination of symptoms should lead to urgent emergency assessment.

Key Takeaway

Heart attack symptoms are not always dramatic.

Chest pressure or squeezing is an important warning sign, but breathlessness, arm or jaw discomfort, sweating, nausea, dizziness and unusual fatigue can also occur. Some people particularly older adults and people with diabetes may have very mild or silent symptoms.

When a heart attack is possible, the safest approach is not to diagnose the problem at home.

Seek emergency medical care promptly.

For Nagarik Hospital's verified emergency information, visit the Emergency Medical Service page or call its listed 24-hour Emergency & Ambulance Service: +977-9801904640.

For non-emergency heart-risk evaluation or follow-up, explore cardiology services at Nagarik Hospital.

This article provides general health information and is not a substitute for diagnosis or individualized medical treatment.