What common symptom may indicate a mild adverse reaction to vaccination?

A mild adverse reaction to vaccination can often be indicated by the presence of a fever. This response occurs as part of the body's immune reaction to the vaccine. When a vaccine is administered, it stimulates the immune system, triggering a response that can result in a temporary fever. This is a normal sign that the body is building protection against the disease the vaccine is meant to prevent.

While nausea and vomiting, rashes, and dizziness may occur after vaccination, they are not as commonly associated with mild adverse reactions as fever is. The fever itself is generally low-grade and resolves within a couple of days, indicating that the vaccine is eliciting the expected immune response without significant complications. Understanding this helps healthcare providers monitor patients after vaccination and reassure them about these common immune responses.