When you’re sick, your body starts to produce more white blood cells to fight off the infection. These white blood cells are produced from the bone marrow. Increased production from the bone marrow is what causes the achy feeling. The white blood cells are being dumped into the bloodstream from the bone marrow.
This is why if you take something to increase your white blood cell count (when going through chemotherapy) You will get achy from it as well.
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