Why does influenza cause muscle aches?

The body-wide soreness of influenza is part of the illness response, not necessarily a sign that you have strained every painful muscle. Immune chemicals can affect how pain is perceived and are often accompanied by fever, chills, poor sleep, and fatigue. Less activity while ill can add stiffness, especially after lying down for long periods. Muscle Aches is a very common presentation of Influenza. Aches can vary from a dull, heavy feeling to tenderness when moving, and they often occur with other flu symptoms.

Prioritise sleep and regular fluids, since fever and sweating can leave you dehydrated and more uncomfortable. Change position gently, and try a warm shower or a heat pack wrapped in a towel if it feels good. Avoid strenuous exercise until fever and significant body aches have passed. An over-the-counter pain or fever medicine may be an option if it is safe for you; use only the label directions and ask a pharmacist about suitability if you have other health conditions, take regular medicines, are pregnant, or are treating a child.

Seek urgent medical care for trouble breathing, chest pain, confusion, a seizure, severe weakness, or signs of severe dehydration. Get prompt assessment if muscle pain is severe in one area, follows an injury, comes with major swelling, or is paired with dark urine or difficulty passing urine. Contact a clinician if you have a condition affecting your immune system, kidneys, heart, or lungs, or if symptoms worsen after initial improvement.

Ask which symptom-relief medicines are appropriate alongside your usual treatment and when you can safely return to exercise. Describe where the aches are, whether weakness is affecting daily tasks, your fluid intake, your temperature if measured, and any change in urine colour or amount.