Signs of influenza

Influenza can cause a stronger whole-body illness than an ordinary cold. Fever or chills may occur with headache, muscle aches, weakness, sore throat, and a dry or productive cough. Some people also have nausea, vomiting, or diarrhoea. Symptoms overlap with other infections, so the pattern alone cannot confirm influenza. Pneumonia is a possible complication when infection affects the lungs, particularly if breathing symptoms become more severe.

Rest, drink fluids regularly, and use suitable fever or pain relief according to the label or a clinician's advice. Stay home while acutely unwell and improve ventilation around others. People at higher risk because of age, pregnancy, chronic illness, or reduced immunity should contact a clinician early, as antiviral treatment may be considered. Do not give aspirin to children or teenagers unless a clinician specifically advises it.

Seek urgent help for difficulty breathing, chest pain, blue or grey lips, severe dehydration, confusion, collapse, or a fever that improves and then returns with worsening cough. Babies, older adults, pregnant people, and those with significant long-term conditions should seek advice sooner if symptoms are intense or rapidly worsening.

Could testing change my treatment? Am I at higher risk of complications? Should I consider an antiviral medicine? When can I safely return to work, school, exercise, or close contact with others?