There are not many details in your question about where exactly your arm hurts, so it is hard to give you specific information. I would recommend going to see your primary care doctor
, especially if the pain continues to be an issue. They will be able to examine your arm and help figure out whether you need x-rays (to rule out a broken arm) or any specific treatment.
Injuries to the arm are pretty common, especially when one falls onto the outstretch warm, as it sounds like you may have. By far the most common form of injury
is a sprain, which causes pain, swelling, and stiffness around one or more joints (such as the wrist, shoulder, or elbow). Depending on the severity of the sprain, it may be treated with rest, ice, and anti inflammatory medications or, in the most severe cases, it may require referral to an orthopedic specialist for additional treatment.
It is also important to make sure you haven't broken any bones. Your doctor will be able to examine the arm and, if there are any areas of focal pain or deformities, they will want to get x-rays to rule out a break.
Speak with your doctor right away!