The useful points to carry forward
- Pain, pressure, heaviness or discomfort in the centre or left side of the chest.
- Discomfort in one or both arms, the shoulders, back, neck, jaw or upper abdomen.
- Shortness of breath at rest or with very little activity.
- Unexplained sweating, nausea, vomiting, light-headedness or sudden dizziness.
Symptoms can be sudden, gradual or easy to dismiss
A heart attack happens when blood carrying oxygen to part of the heart muscle becomes blocked. Some attacks cause intense chest pain, but others begin slowly with mild pressure, heaviness or discomfort. Symptoms may come and go, and a person's second heart attack may not feel like an earlier one.
Chest discomfort is the most common warning sign, yet it is not the only one. Older adults and people with diabetes may have very mild symptoms or a silent heart attack. Women can also experience chest discomfort, but unusual tiredness, nausea, shortness of breath or pain away from the chest may be prominent.
Know the possible warning pattern
No single symptom confirms a heart attack outside a medical assessment. The concern rises when symptoms are new, unexplained, occur together or feel different from a person's usual pattern. Do not rely on pain severity alone.
Heartburn, anxiety, muscle strain and other conditions can resemble heart symptoms, but it is unsafe to make that distinction at home when a heart attack is possible. Emergency clinicians can use an examination, heart tracing and blood tests to investigate the cause.
- Pain, pressure, heaviness or discomfort in the centre or left side of the chest.
- Discomfort in one or both arms, the shoulders, back, neck, jaw or upper abdomen.
- Shortness of breath at rest or with very little activity.
- Unexplained sweating, nausea, vomiting, light-headedness or sudden dizziness.
- Unusual tiredness, weakness, or a rapid or irregular heartbeat.
When in doubt, make the emergency call
If you think you or someone else may be having a heart attack, call your local emergency number immediately—even if you are not certain. Follow the dispatcher's instructions and do not delay the call while waiting for symptoms to settle or while trying food, antacids, aspirin or another remedy.
An ambulance is generally the safest transport because trained professionals can assess the person and begin emergency care on the way. Do not drive yourself. This article cannot diagnose chest symptoms or replace individual emergency advice.
Guidance can change. This source was last checked for this article on 3 October 2026. See the editorial policy.