Thyroid problems affect the thyroid, a gland in the neck that helps control many of your body’s key metabolic processes. Posted on 15 December 2014 at 03:48 Thyroid problems affect the thyroid, a gland in the neck that helps control many of your body’s key metabolic processes. Thyroid problems affect the thyroid, a gland in the neck that helps control many of your body’s key metabolic processes.