What are some normal feelings for patients after vaccination?

After vaccination, it is common for patients to experience a variety of normal, expected feelings or symptoms as their immune system begins to respond to the vaccine. These can include soreness at the injection site, which is a direct response to the administration of the vaccine and indicates the immune system is recognizing the vaccine components. Mild fever and fatigue are also typical responses, as they reflect the body's active engagement in building immunity. This immune response may lead to a slight increase in body temperature and a feeling of tiredness as the body uses energy to mount an effective defense.

The other options, while they may be experienced by some patients, do not represent the normal range of reactions expected after vaccination. Muscle pain and severe headaches, for example, are not commonly classified as routine post-vaccination effects and may suggest a different underlying issue or an adverse reaction that should be monitored. Therefore, the correct answer effectively identifies the common, mild experiences many patients may have as part of the body’s natural response to vaccination.