What should I do if my arm feels a bit swollen after getting the vaccine?

After vaccination, mild arm swelling may occur. This can be managed by observing the characteristics of symptoms, applying local cold compresses, avoiding irritation at the injection site, getting proper rest and relaxation, and staying hydrated. These measures address common local reactions following vaccination. If swelling continues to worsen, spreads, or is accompanied by high fever or rash, prompt medical attention is recommended.

1. Observe symptom characteristics: Pay attention to the extent and severity of swelling, as well as whether it is associated with pain, redness, or hard lumps. If swelling is mild and without other discomfort, it is usually caused by the vaccine stimulating local tissues and typically resolves within 1–2 days.

2. Relieve with local cold compress: Within 24 hours after vaccination, apply a cold pack wrapped in a clean towel to the swollen area for 15–20 minutes per session, 2–3 times daily. This helps reduce local congestion and edema and alleviates discomfort.

3. Avoid irritating the injection site: Do not rub or press on the swollen area. Avoid lifting heavy objects or engaging in vigorous exercise using the vaccinated arm. Keep the area away from dirty water or irritants to prevent infection and worsening discomfort.

4. Get appropriate rest and relaxation: Ensure adequate rest and minimize use of the vaccinated arm to allow muscles and surrounding tissues time to recover, promoting resolution of swelling and preventing strain on the affected area.

5. Stay hydrated: Drink moderate amounts of warm water to support metabolism and help your body adapt to the vaccine, which may indirectly ease local reactions. Avoid alcoholic beverages, strong tea, and other stimulants.

Keep the injection site clean and dry after vaccination. Wear loose, breathable clothing to reduce friction. Maintain a light diet and avoid spicy or greasy foods. Monitor symptoms closely—mild swelling is generally not a cause for concern and usually resolves on its own.