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1.In this case the gland itself can be the cause, due to the inflammatory change there is enlargement of the gland ( possibly you are talking about
thyroid )
2.Incase of infection or inflammation , localised or systemic you can get the
fever and temperature changes.
3.So an
ultrasound of the gland will help to evaluate the possible pathology in the gland, its blood supply.
4.After that if required an FNAC from the swollen gland will give definitive cause for the symptoms.
5.At the same time an abdomen pelvis ultrasound to asses internal organs any thing is causing the symptoms.
6.Suggest to get appointment and get evaluated and treated accordingly. Good luck.
Hope i have answered your query.
Any thing to ask do not hesitate
http://doctor.healthcaremagic.com/doctors/dr-ganesh/62888 Thank you.