A pulmonary embolism (PE) is a serious medical condition that occurs when a blood clot, usually from the leg, travels through the bloodstream and becomes lodged in an artery in the lungs. This blockage prevents oxygen from reaching the lung tissues and can put significant strain on the heart. Because a pulmonary embolism can be life-threatening, recognising the symptoms quickly is essential for receiving urgent medical care. In the UK, healthcare professionals categorise these symptoms based on their sudden onset and the way they affect breathing and circulation. For individuals with a known clotting disorder, being aware of these signs is a critical part of their long-term health management.
What We’ll Discuss in This Article
- Recognising sudden changes in breathing and breathlessness
- Characteristics of chest pain associated with a lung clot
- Other physical signs, including coughing and heart rate changes
- How a pulmonary embolism relates to deep vein thrombosis (DVT)
- The importance of sudden onset in identifying an emergency
- When to contact emergency services in the UK
Sudden Shortness of Breath
The most common and significant symptom of a pulmonary embolism is shortness of breath that usually appears very suddenly. Unlike the gradual breathlessness associated with a cold or general lack of fitness, PE-related breathlessness occurs rapidly and may be present even when a person is sitting still or lying down. It often feels as though it is difficult to take a full breath, and the sensation typically worsens with any level of physical exertion. The NHS emphasizes that sudden, unexplained shortness of breath is a primary warning sign that requires immediate clinical assessment to rule out a blockage in the pulmonary arteries.
Characteristics of PE-Related Chest Pain
Chest pain caused by a pulmonary embolism has specific characteristics that help distinguish it from other types of pain. It is often described as a sharp, stabbing sensation that becomes noticeably worse when taking a deep breath, coughing, or eating. This is known as pleuritic chest pain, and it occurs because the inflamed lining of the lung rubs against the chest wall. The pain does not typically go away with rest and may be felt anywhere in the chest area, though it is often localized to the side where the blockage has occurred.
Coughing and Other Respiratory Signs
In some cases, a person with a pulmonary embolism may develop a cough. This cough is often dry, but it can sometimes produce blood or blood-streaked mucus, a symptom known as haemoptysis. While coughing up blood can be caused by many conditions, when it occurs alongside sudden breathlessness or chest pain, it is strongly suggestive of a vascular issue in the lungs. NICE guidelines provide clear pathways for healthcare providers to evaluate these respiratory symptoms alongside a patient’s risk factors for blood clots to ensure rapid diagnosis.
Impact on Heart Rate and Circulation
Because the heart must work harder to pump blood past the blockage in the lungs, a pulmonary embolism often affects the circulatory system. This can manifest as a rapid heart rate (tachycardia) or a feeling that the heart is racing or skipping beats. Some individuals may also feel lightheaded, dizzy, or may even faint (syncope). In severe cases, the skin may appear clammy or slightly blue, especially around the lips or nails, which indicates that the body is not receiving enough oxygenated blood.
The Connection to Leg Symptoms
Many people who experience a pulmonary embolism will also have symptoms of a blood clot in their leg, such as swelling, pain, or redness. However, it is important to note that a pulmonary embolism can occur without any preceding leg symptoms. In these instances, the entire clot may have detached from the leg vein and moved to the lungs, or the original clot may have been small enough not to cause noticeable swelling. Identifying a current or recent history of leg pain is a helpful diagnostic clue for medical professionals.
Identifying an Emergency Situation
The hallmark of a pulmonary embolism is the suddenness of the symptoms. While conditions like asthma or chest infections can cause breathing difficulties, they usually develop over a longer period or have a known history. A sudden “thunderclap” of breathlessness or sharp chest pain in someone who was previously feeling well—especially if they have risk factors like recent surgery or long-distance travel—should always be treated as a potential emergency.
Conclusion
Symptoms that suggest a pulmonary embolism include sudden breathlessness, sharp chest pain that worsens with deep breathing, and a rapid heart rate. Because these signs indicate a potential blockage in the lungs, they require immediate medical investigation. For those with a known predisposition to clotting, early recognition of these symptoms can be life-saving. Following established UK emergency protocols ensures that the necessary diagnostic tests and treatments are provided without delay. If you experience severe, sudden, or worsening symptoms, call 999 immediately.
Can a pulmonary embolism feel like a panic attack?
Yes, because both can cause sudden breathlessness and a racing heart, they are sometimes confused; however, a PE is often accompanied by sharp pain when breathing, which is not typical of a panic attack.
Is a pulmonary embolism always fatal?
No, most cases of pulmonary embolism are successfully treated with anticoagulant medication if they are diagnosed promptly.
Can I have a pulmonary embolism if I am fit and healthy?
While rarer, fit individuals can still develop a PE, especially if they have an underlying clotting disorder or encounter triggers like major surgery or long-distance travel.
Does a pulmonary embolism cause a fever?
Sometimes a low-grade fever can occur as the body reacts to the inflammation caused by the clot, but it is not the primary symptom.
How do doctors check for a pulmonary embolism?
In the UK, diagnosis typically involves a combination of blood tests (like a D-dimer), a chest X-ray, and a specialist scan known as a CT pulmonary angiogram.
Can a pulmonary embolism happen after a flight?
Yes, the risk is increased for several days after a long-haul flight due to the prolonged immobility, which can lead to a clot forming in the legs and moving to the lungs.
Does the chest pain move to the arm like a heart attack?
PE pain is usually localized to the chest and worsens with breathing; heart attack pain is often described as a heavy pressure that may radiate to the left arm or jaw.
Authority Snapshot (E-E-A-T)
This article outlines the clinical symptoms of a pulmonary embolism based on UK emergency medicine standards. The content is reviewed by Dr. Stefan Petrov, a UK-trained physician with experience in emergency departments and intensive care where pulmonary embolisms are diagnosed and managed as acute emergencies. All information is strictly aligned with the symptomatic recognition and safety guidelines provided by the NHS and NICE.
