There are some reactions after taking vaccines of covid. These reactions are known as a covid arm. Soreness and swelling are the common reactions at the site of injection. Sometimes common symptoms are common itchy rashes, redness in the area, and some other symptoms. The covid arm is uncomfortable but it is rare and harmless. It occurs around 1 or 2 weeks after the first or second shot of vaccination.

The covid arm is mostly caused by the Moderna vaccine. The covid arm reaction is short-lived and can be treated easily.

Symptoms of covid arm        

It is a harmless reaction that is caused due to the modern vaccine. It is found that the Pfizer-BioNTech vaccine can also cause covid arm. So, covid arm is a hypersensitivity skin reaction that takes place on or around the injection site. Symptoms of the covid arm may occur around 1 or 2 weeks after the first and second shots of vaccines. Some common symptoms are-

  • Intense itching
  • A red-colored rash that may vary in size
  • The rashes may spread on your hands or fingers
  • Swelling
  • Pain
  • Skin feels warm to the touch
  • Hard lump on the site of injection

This reaction is not rare and not very dangerous at all. If you are listening about it, there is no need to get panic It is a harmless infection. There is a very few

Causes of Covid arm                                         

It is an immune system reaction. Your immune cells respond to the muscle cells that absorbed the vaccine. The immune system thinks of infection to the proteins produced by the vaccines. It is still unknown that exactly what mechanism triggers the covid arm reaction. This reaction and many other reactions are still studying.

How long does it last?

The symptoms occur from 3 to 5 days. It is not a life-threatening condition or serious allergic reaction.


Treatment of covid arm will not reduce your immune system’s response. The covid arm will also not stop you from getting your second shot. In some cases, your doctor or vaccination provider may recommend you alternate arms if you had a severe skin reaction. Even it can be uncomfortable and not serious at all. Many home treatments are there to reduce pain, swelling, and itching.

  • Cold compresses
  • Topical steroids
  • Topical medications
  • Oral antihistamines
  • Acetaminophen such as ibuprofen

Should you be worried about the covid arm?

The covid arm usually takes place for some time and not serious reactions. Usually, there are rashes on the area of injection and sometimes the injected arm becomes warm. The immune system which is making the antibodies will ramp things up to clear the virus. On the other hand, your immunity is trying to destroy the virus. This is the battle here. That is why the covid vaccines are important and valuable to every person. Hence, there is no need to worry about the covid arm.

Vaccine safety

Covid arm is a minor reaction that will disappear within a few days. The vaccine is highly recommended for covid- 19 as it is a life-threatening condition. If you are thinking about the covid arm remember the protective benefits of the covid – 19 vaccines rather than the risk associated with covid arm reaction. It is also important to consult with your doctor about the side effects of the vaccines and the treatment for the same.

The bottom line

It is a hypersensitivity skin reaction that occurs mainly from the Moderna vaccine. The main symptoms are itching, pain, and swelling. It is a rare reaction and not so serious and can be caused by not only the covid vaccine but many vaccines also. If you want to consult your doctor about the covid arm then it is fine. Ask him/her and get information about it. But, there is no need to worry about the covid arm, and you should take the vaccine of covid.


To conclude, the covid arm is the skin reaction that can be caused after the vaccination at the site of injection. Soreness, swelling, pain, and itchiness are the most common symptoms of the covid arm. Due to which itchy rashes, redness on the area, and many other symptoms are visible. The symptoms for the covid arm may start from three to five days after the vaccine and can last up to one or two weeks. This is a rare reaction of the skin and not so serious. There is no specific treatment for the reaction but you can treat it with some home remedies like you can compress ice in the rashes. It will provide relief from the redness. You can also put some steroid tubes on the affected area and can use some medicines also. So, you should take the vaccine.