 [ Symptoms ] do i see a dermatologist or a podiatrist for psoriasis of the feet  for years i thought i had athlete is foot & nail fungus    and though it might have been the case i now recognize the blistering on top of my feet as psoriasis should i see at dermatologist or podiatrist i have been to a dermatologist who tried to treat the nail fungus but it did not work    my 3rd attempt i am in my 60s now and have suffered from some variation of this since my late 30s it is painful and humiliating in appearance [ Disease ] tsh is thyroid stimulating hormone produced by the pituitary gland in the brain tsh stimulates the thyroid gland to produce and release thyroid hormone into the blood thyroid hormone maintains normal metabolism growth body temperature and many other essential bodily functions blood levels of tsh and thyroid hormone are maintained in a tight balance high levels of thyroid hormone cause the pituitary to reduce the release of tsh low levels of tsh lead the pituitary to release more tsh this in turn stimulates the thyroid gland which produces more thyroid hormone which reduces the tsh level this relationship is called a negative feedback loop doctors use the blood tsh level as a screening blood test for thyroid function high tsh usually means an underactive thyroid hypothyroidism low tsh is usually due to an overactive thyroid hyperthyroidism in people being treated for hypothyroidism or hyperthyroidism tsh also provides information on the success of treatment