Explain how the endocrine system can malfunction

Explain how the endocrine system can malfunction

Explain how the endocrine system can malfunction. You may wish to use diagrams to support this piece of work.
Research the following conditions:
1) Goitre
2) Cushing’s Syndrome
3) Diabetes Mellitus
4) Pituitary Dwarfism
For each you need to explain:
a) What is the cause? Which hormones are involved?
b) What are the normal / healthy levels of these hormones in the blood?
c) How are these levels measured?
d) What are the symptoms of each disease and how do they come about?