Fever and shortness of breath: what should you know?

Breathlessness with fever may occur with acute bronchitis or another respiratory infection. Asthma, COPD, bronchiectasis, anaemia, and heart conditions can also affect breathing, while anaphylaxis can cause sudden breathing difficulty with swelling or hives. Note whether breathlessness happens at rest or with activity, whether there is chest pain, wheezing, cough, blue lips, or leg swelling, and how quickly it developed.

Sit upright, loosen tight clothing, rest, and avoid smoke or exertion. Follow an existing prescribed inhaler or emergency plan exactly as instructed. Sip fluids if you can swallow comfortably. Do not drive yourself if breathing is worsening, and do not rely on a home oxygen reading alone to decide that you are safe; symptoms and appearance matter too.

Call emergency services for severe or rapidly worsening breathlessness, inability to speak normally, blue or grey lips, confusion, fainting, severe chest pain, or swelling of the face, lips, or tongue. Seek prompt medical review for new breathlessness with fever, persistent wheezing, coughing blood, or a painful swollen leg. People with significant heart or lung disease should use their agreed escalation plan.

Could this be an infection, airway flare, anaemia, heart problem, or allergic reaction? Do I need examination, testing, or a written breathing plan? Which symptoms should trigger emergency action?