Why does mpox cause fever?

When the immune system detects a virus, it releases chemical messengers that can affect temperature regulation in the brain. You may then feel chilled while your temperature rises, followed by sweating as it falls. Fever is a common presentation of Mpox and may occur with tiredness, headache, muscle aches, swollen lymph nodes, or a rash. These features are not specific to mpox, so a fever alone cannot identify the cause.

Rest, drink fluids regularly, and wear light clothing if you are feverish. Use a fever medicine only as directed on its label or by a clinician, and check first if you have liver or kidney disease, take other medicines, or are treating a child. If mpox is possible, avoid close skin-to-skin contact and sharing bedding, towels, clothing, or utensils until you have spoken with a healthcare professional. Keep any rash clean and covered where practical, and contact a local healthcare service for testing and personalised guidance.

Seek urgent medical care for difficulty breathing, confusion, severe headache with a stiff neck, fainting, severe dehydration, eye pain or vision changes, or rapidly worsening illness. Contact a clinician promptly if you have a new unexplained rash with fever, painful sores, are pregnant, have a weakened immune system, or symptoms make it hard to drink or pass urine normally.

Ask whether your symptoms need testing, how to manage pain or fever safely, and how to reduce contact risk at home. Describe when fever began, whether a rash or swollen glands appeared, recent close contact, and any medicines or health conditions that could affect treatment choices.