Why does influenza cause sore throat?

The influenza virus affects the breathing passages, including the nose and throat. Your immune system responds by increasing blood flow and sending immune cells to the area. This can leave the throat red, dry, scratchy, or painful when swallowing. Coughing, breathing through a blocked nose, and drainage from the nose can add further irritation. Sore Throat is a very common presentation of Influenza, but a sore throat also has many other causes.

Rest, drink fluids regularly, and choose warm or cool drinks according to what feels soothing. Soft foods may be easier to swallow while the throat is tender. Avoid smoking and smoky places, which can aggravate irritation. A pharmacist can advise on suitable pain relief or throat products, taking account of your age, medical conditions, and other medicines. Stay home while you feel unwell and follow local public-health advice to reduce spread to others.

Seek urgent medical care for trouble breathing, an inability to swallow saliva, confusion, fainting, severe weakness, or blue or grey lips. Contact a clinician promptly if symptoms are worsening, you are dehydrated, or you have a long-term heart, lung, kidney, or immune condition. Young children, older adults, and pregnant people may need earlier assessment when flu-like symptoms develop.

Ask whether your symptoms fit influenza or whether a throat examination or test is needed. Mention when symptoms started, whether you have fever or cough, and any medicines you have already taken. Ask what warning signs should lead you to seek care again.