What are the side effects of the flu vaccine?
Feb 07, 2025
Source: Cainiu Health
Dr. Ren Yi
Introduction
The side effects of the influenza vaccine include pain at the injection site, fever, general muscle aches, allergic reactions, nausea, and vomiting. Pain at the injection site is one of the common side effects following influenza vaccination, characterized by pain, redness, or swelling at the injection site. These reactions are usually mild and will resolve on their own within a short period of time. Appropriate rest and avoiding touching the injection site can help alleviate the pain.
Generally, the side effects of the influenza vaccine include pain at the injection site, fever, general muscle aches, allergic reactions, nausea, and vomiting. A detailed analysis is as follows:
1. Pain at the Injection Site
Pain at the injection site is one of the common side effects following influenza vaccination, manifesting as pain, redness, or swelling at the injection site. These reactions are usually mild and resolve spontaneously within a short time. Appropriate rest and avoiding touching the injection site can help alleviate the pain.
2. Fever
Some individuals may experience fever after receiving the influenza vaccine. This occurs because, after the vaccine enters the body, the immune system mounts a response, generating some heat. The fever is typically low-grade and usually resolves by itself within 1–2 days.
3. General Muscle Aches
Following influenza vaccination, some individuals may feel general muscle aches. This is due to the immune system's response to the vaccine and typically resolves spontaneously within a short time. Adequate rest and sufficient sleep can help alleviate these symptoms.
4. Allergic Reactions
A very small number of individuals may experience allergic reactions to certain components of the influenza vaccine. Symptoms of an allergic reaction may include itching, skin rash, or difficulty breathing. If an allergic reaction occurs, immediate medical attention should be sought, and treatment should be conducted under a doctor's guidance.
5. Nausea and Vomiting
Some individuals may experience symptoms such as nausea and vomiting after receiving the influenza vaccine. These gastrointestinal symptoms are usually mild and temporary, requiring no special treatment. Appropriate rest and attention to food hygiene can help relieve these symptoms. If symptoms persist or worsen, prompt medical attention is advised.
Prior to receiving the influenza vaccine, it is recommended to consult with a doctor and understand the relevant precautions and contraindications to ensure the safety and effectiveness of the vaccination.
