What is a common side effect of vaccines?

Mild fever and soreness at the injection site are common side effects experienced after receiving vaccines. These reactions are typically indications that the immune system is responding to the vaccine as it works to build protection against the disease. The soreness at the injection site results from a localized immune response, and a mild fever can occur as part of the body’s overall immune reaction. These side effects are usually transient and resolve on their own within a few days.

While other options may represent more serious or less common outcomes, they do not reflect the typical response to vaccines. Severe allergic reactions are rare but can occur in susceptible individuals, and immediate hospitalization is not a standard outcome for most vaccinated individuals. Consistent hair loss is not recognized as a side effect associated with vaccines. Thus, recognizing the common side effects helps reassure individuals about what to expect after vaccination.