Pain (muscle aches)
When you have an infection like food poisoning, your body might start to ache, simultaneously, body pains due to unexplainable contraction of muscles. As your immune system responds to threat, inflammation occurs in your body which triggers ache in the body. Due to the immune response in the body, some chemical agents are sent to other parts of the body that triggers the pain receptors, part of these is called cytokines and histamine. For example, in this process histamine is released to help widen blood vessels so more white blood cells can get through to fight the infection. [7]
