What is an increase in sudoriferous gland activity called?

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.