Why Does Arm Hurt After Flu Jab

Why Does Arm Hurt After Flu Jab?

After receiving a flu jab, it's not uncommon to experience some soreness or pain in the injection site. This is a normal immune response to the vaccine, and it typically subsides within a few days.

There are a few reasons why the flu jab can cause arm pain. First, the vaccine contains inactivated or weakened flu viruses. When these viruses are injected into the body, they trigger an immune response that involves the production of antibodies. This process can cause inflammation and soreness at the injection site.

Second, the flu jab is typically given in the deltoid muscle of the upper arm. This muscle is relatively small, and it can be irritated by the injection. Additionally, the needle used to administer the vaccine can cause some damage to the muscle fibers, which can also lead to pain.

The severity of the arm pain after a flu jab can vary from person to person. Some people may only experience mild discomfort, while others may experience more severe pain that lasts for several days. The pain is usually worse during the first 24-48 hours after the injection, and it gradually improves over time.

There are a few things you can do to relieve the arm pain after a flu jab:

  • Apply a cold compress to the injection site.
  • Take a warm bath or shower.
  • Do some light exercise, such as walking or stretching.
  • Take over-the-counter pain medication, such as ibuprofen or acetaminophen.

If the arm pain is severe or does not improve after a few days, it's important to see a doctor. In rare cases, the flu jab can cause a more serious side effect, such as cellulitis or an abscess. These conditions require medical treatment.

Despite the potential for arm pain, it's important to get a flu jab every year. The flu is a serious illness that can lead to hospitalization and even death. The flu jab is the best way to protect yourself from the flu and its complications.


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