Introduction: A Case of Borderline Personality Disorder? -- 1. The Endocrinological System -- 2. Thyroid Disorders: Hyperthyroidism and Hypothyroidism -- 3. Adrenal, Pituitary, and Parathyroid Disorders --4. Introduction to Seizure Disorders -- 5. Brain Anatomy and Localization of Function -- 6. Generalized and Simple Focal Seizures -- 7. Complex Partial Seizure Disorder: Temporal Lobe Epilepsy -- 8. Multiple Sclerosis and Mitral Valve Prolapse -- 9. Systemic Lupus Erythematosus (SLE) and Other Disorders -- 10. Interacting With Medical Specialists: A Practical Guide -- 11. Conclusions -- App. A. The Relationship Between Various Psychiatric Disorders and Physical Disorders to be Considered -- App. B. Questions to Ask Patients to Rule Out Physical Disorders and Quick Symptom Guide