Tag: Deltoid muscle

While soreness is the most common side effect of a vaccination, some people experience more intense, persistent pain [1.2.4]. Understanding 'Why does my shoulder hurt so bad after a shot?' involves differentiating between a normal immune response and a potential injury.

Each year, 16 billion injections are administered worldwide [1.7.1]. While a necessary medical procedure, the pain can vary significantly. Understanding what is the most painful injection site involves looking at anatomy, medication, and technique.