Which of the following is NOT a common cause of shock?

Degenerative diseases such as multiple sclerosis primarily affect the nervous system and lead to a gradual decline in physical function. These conditions do not typically result in shock, which is a state of inadequate tissue perfusion leading to cellular damage. In contrast, severe allergic reactions can trigger anaphylactic shock, massive hemorrhage can lead to hypovolemic shock, and cardiac arrest can cause cardiogenic shock. These situations directly impair the body's ability to maintain adequate blood flow and oxygen delivery to tissues, thereby making them common causes of shock. While multiple sclerosis may have various complications, it does not cause shock in the same acute manner as the other options listed.