A sore arm, headache, fatigue, nausea, dizzy spells, aching joints and sore muscles.
These are the common side-effects reported by some of the 15 million NHS patients to get their first dose of a Covid-19 vaccine, as well as the 500,000 or so who have had their scheduled second dose.
But rather than being something to dread, they could show you the vaccine is actually working.
The Medicines & Healthcare products Regulatory Agency (MHRA), which monitors vaccine safety in the UK, says more than one vaccine recipient in ten experiences some of these adverse reactions when given either of the two jabs currently in use in the UK (Pfizer/BioNTech and AstraZeneca), but that they usually clear up on their own, or with over-the-counter pain medication such as paracetamol, in a few days.