The purpose of a flu shot is, of course, to prevent you from developing this potentially serious seasonal illness. The shot, however, might cause soreness at the injection site.

Arm pain when hitting a volleyball can be due to a wide range of reasons. You can incur systemic-overuse damage after playing for years or develop a sudden injury by spiking the ball and applying excessive pressure on your arm at one time.

There are numerous causes of jaw and arm pain. According to MedlinePlus, jaw and teeth pain, along with arm pain, may signal a serious medical condition or event such as a heart attack. On the other hand, the pain may be indicative of less serious problems.

You might not be aware of how much you use your left arm on a daily basis until you begin experiencing pain in that arm and elbow. The most common causes for pain in the left arm and elbow include injury, inflammation, nerve damage, or a heart-related condition.