Heart attack symptoms:
how to recognize them and when to call for help

Article written and reviewed by Dr Luca Moretti

A heart attack does not always cause the classic sudden, extremely severe chest pain. The most common symptom is pain or discomfort in the center of the chest, often described as pressure, heaviness, tightness, or squeezing, but shortness of breath, sweating, nausea, weakness, dizziness, and pain extending to the arms, shoulders, back, neck, or jaw may also occur.
If these symptoms raise suspicion of a heart attack, especially when they are new, persistent, or occur together, you should call 112 or 118 immediately. There is no need to wait for the pain to become very severe, and driving yourself to the emergency department is not advisable.

Signs that deserve particular attention include:

• pain, pressure, heaviness, or tightness in the center of the chest;
• pain or discomfort in one or both upper limbs;
• pain in the shoulders, back, neck, jaw, or upper abdomen;
• shortness of breath, even without chest pain;
• sudden sweating, especially cold sweating;
• nausea or vomiting;
• dizziness, marked weakness, or a feeling of fainting;
• sudden or unusual fatigue.

Myocardial infarction is one of the main manifestations of acute coronary syndromes. This guide does not address classification, pathophysiology, or treatment, but answers the most important practical question: which symptoms may raise suspicion of a heart attack and when help should be sought.

How a heart attack can present: signs to recognize

Chest pain or discomfort is the symptom that most often raises suspicion of a heart attack. It is usually felt in the center of the chest or behind the sternum. However, people do not always use the word "pain": they may describe a sensation of heaviness, pressure, squeezing, burning, or tightness, or simply discomfort that is difficult to define.
Onset may be sudden, but it may also be gradual. The discomfort may increase over several minutes, remain relatively stable, or ease and then recur. Intensity also varies: a heart attack can cause very severe pain, but it may also present with moderate discomfort that is initially underestimated or attributed to the stomach, back, or chest muscles.

Chest symptoms may be accompanied by shortness of breath, sweating, nausea, vomiting, weakness, dizziness, or a feeling of fainting. These symptoms become particularly significant when they occur together, when they are new compared with usual symptoms, or when they develop without an obvious cause.
European guidelines consider chest pain lasting more than 15 minutes or recurring within about one hour particularly alarming. This indication should not, however, be used as a stopwatch: if symptoms are strongly suspicious, you should not wait 15 minutes before calling for help.

Heart attack pain: what it may feel like and where it may be felt

Heart attack pain is not necessarily a localized sharp pain. More often it is described as a diffuse sensation of pressure or tightness in the center of the chest. Some people report heaviness, others burning, crushing, or discomfort resembling severe indigestion.
The pain may remain in the chest or radiate. The left arm is a well-known site, but it is not the only one and should not become an essential criterion for suspecting a heart attack. The discomfort may extend to the right arm or both arms, shoulders, back, neck, jaw, and, in some cases, the upper abdomen.

A heart attack may begin during exertion, but also at rest or during sleep. The fact that the pain changes in intensity or temporarily disappears also does not mean that the problem has resolved: ischemic symptoms may be intermittent.
Chest pain has many possible causes, and not all are cardiac. Reflux, musculoskeletal disorders, and respiratory diseases may cause similar symptoms; there are also other emergencies, such as pulmonary embolism or aortic dissection, that may present with chest pain. When the clinical picture is suspicious, trying to make the diagnosis yourself can waste valuable time.

When a heart attack does not present as expected

A heart attack can occur even without chest pain. In some cases the dominant symptom is shortness of breath; in others, nausea, sweating, weakness, dizziness, general malaise, or pain localized to the back, neck, or jaw predominate. These presentations may be less immediately recognizable and therefore delay the request for medical assistance.
In women, chest pain or discomfort remains a common symptom, but shortness of breath, nausea, unusual fatigue, and pain in the back, shoulders, neck, or jaw may also be relatively frequent. For this reason, rigidly dividing symptoms into "typical" and "atypical" is not useful: a less stereotyped presentation may still be compatible with an acute coronary event.

In older adults and people with diabetes, the presentation may also be less obvious. Dyspnea, sudden weakness, dizziness, syncope, or an unexplained deterioration in general condition may be more prominent than classic chest pain.
Finally, some heart attacks are not recognized when they occur because symptoms are absent, mild, or attributed to other causes. A so-called silent heart attack is not, however, a harmless event: myocardial damage may be real even when the episode is discovered only later.

When to call 112 or 118 immediately

If suspicious chest pain or discomfort occurs, especially when it is prolonged, recurrent, or associated with shortness of breath, sweating, nausea, weakness, dizziness, or radiating pain, the safest choice is to call 112 or 118 immediately.
You should not wait for the pain to become unbearable, and you should not be reassured solely because the symptom has temporarily eased. Acute coronary syndromes include time-dependent conditions in which rapid assessment can change the care pathway and treatment.

It is preferable not to drive yourself to the emergency department. Your condition may worsen during the journey, and the emergency medical system can begin assessment and care at the scene and during transport. After calling, you should follow the instructions provided by the emergency dispatch center and avoid taking initiatives or medications on your own without medical advice.
If a person loses consciousness and is not breathing normally, the situation may have progressed to cardiac arrest. In this case, this must be reported immediately to the emergency operator and cardiopulmonary resuscitation should be started according to the instructions received. If an automated external defibrillator is available, the device's voice instructions guide its use.

Frequently asked questions about heart attack symptoms

What is the most common symptom of a heart attack?
The most common symptom is pain or discomfort in the center of the chest, often described as pressure, heaviness, tightness, or squeezing. It may, however, be mild, intermittent, or associated with other symptoms.
Can you have a heart attack without chest pain?
Yes. In some cases, shortness of breath, nausea, sweating, weakness, dizziness, or pain in other areas may predominate, even without obvious chest pain.
Does heart attack pain always involve the left arm?
No. It may radiate to the left arm, right arm, both arms, shoulders, back, neck, jaw, or upper abdomen.

How long must pain last to raise suspicion of a heart attack?
Prolonged or recurrent pain is a warning sign. Guidelines consider pain lasting more than 15 minutes or recurring within one hour particularly suspicious, but this threshold should not be awaited if the clinical picture already suggests an emergency.
When should you call 112 or 118?
When symptoms compatible with a heart attack occur, especially chest pain or pressure associated with shortness of breath, sweating, nausea, weakness, or radiating pain, emergency services should be called immediately.