As flu season starts, many people are lining up to get their flu shots. The flu, short for influenza, is an infection that affects the nose, throat, and lungs, all parts of the respiratory system. It’s caused by the influenza virus. While most people recover without medical treatment, the infection can sometimes lead to serious complications, especially for those in higher-risk groups.Getting vaccinated is the most effective way to protect yourself from the flu and reduce the risk of its complications. The flu shot helps lower the chances of catching the virus and can also prevent severe illness, hospitalisation, or death. This year’s flu vaccines protect against three influenza strains that researchers believe will be the most common. However, many people who have received the shot say they’ve been dealing with arm pain afterwards, so is that something to worry about?Why Does My Arm Hurt After I Get a Shot?It is normal for your arm to hurt after a flu shot. The U.S. Centers for Disease Control and Prevention (CDC) refers to this as “soreness,” and says it usually stays around the injection site. The discomfort typically fades within a day or two.Pain After a Flu Shot: What’s Normal?Mild soreness or tenderness in the arm is common after getting vaccinated. You may also notice a bit of redness or swelling where the needle went in. According to Today.com, this is simply inflammation, which is a sign that your body is responding to the vaccine. The site notes that if you don’t feel pain, that doesn’t mean the vaccine isn’t working, as everyone’s immune response varies.The soreness may appear right after the shot or develop a few hours later. It often feels worse when you put pressure on the arm (like sleeping on it) or when you lift it above your head. Still, this pain is usually mild and shouldn’t keep you from doing your normal daily activities.What Is Not Normal After Getting a Flu Shot?While mild soreness is expected, anything beyond that may need attention. Pain that spreads beyond the injection site or feels sharp and intense could signal something else. According to health experts, symptoms linked to shoulder injuries related to vaccine administration (SIRVA) or other post-vaccine issues can include:Pain that travels away from the injection spot, such as down the arm or past the shoulderSharp, severe, or increasing pain instead of improvementPain that doesn’t ease after two daysTingling or burning sensations, dizziness, breathing difficulty, fainting, vomiting, diarrhoea, or a rapid heartbeatIf you experience any of these, it’s best to seek medical advice.How to Reduce Arm Soreness After a Flu ShotSome amount of soreness is expected, but if you’d like to prevent or ease it, there are simple steps you can take. Kaiser Permanente recommends staying relaxed during the shot. Keeping your arm loose at your side helps prevent muscle tension, which can make soreness worse later.After the shot, you can try the following to ease discomfort and recover faster:Apply Ice: Cooling the injection area can help reduce inflammation and swelling.Use a Warm Compress: Heat helps relax tense muscles and relieve pain. You can switch between ice and heat to see which works better.Keep the Arm Moving: Light movements or gentle stretching can prevent stiffness and reduce soreness.Rest: While movement helps, don’t overexert yourself. Resting allows your body to build immunity more effectively.Take Pain Relievers: According to Kaiser Permanente, over-the-counter medications like ibuprofen, naproxen, or acetaminophen can help lessen pain and swelling. However, it is best to check with your doctor before taking any medication.