Final answer:
Rheumatoid arthritis and Addison's disease are medical conditions that can cause hypomanic or manic symptoms.
Step-by-step explanation:
Hypomanic or manic symptoms can be caused by certain medical conditions, such as autoimmune diseases. One example is rheumatoid arthritis, which is an autoimmune disease that affects the joints. Another example is Addison's disease, which is an autoimmune disease that affects the adrenal glands. Medical conditions like diabetes mellitus and fibromyalgia do not typically cause hypomanic or manic symptoms.