An increase in sudoriferous gland activity is called hyperthyroidism.
It happens when these sudoriferous glands, which are also known as sweat glands, affect the thyroid gland in such a way that it starts producing excessive amounts of thyroid hormone, which leads to this condition. In normal amounts, thyroid hormone regulates metabolism, but if there is too much of it, it can cause problems.
As any other ancient civilization, the Sumerians were traders as well. And they had a few good reasons to do this.
Because they traded, their trading partners were less likely to attack them, because it would hurt their economy as well. Furthermore, they didn't produce everything they needed and traded those goods with goods which they produced too much of.
And lastly, through trade they could also get exotic goods which they would have never gotten otherwise.