1) Inherited Disorder: I hope it means genetic disorders. Eg: Down syndrome
Exposure to toxic substances: Eg: Exposure to asbestos causes mesothelioma, which is a form of cancer that forms around lining of the lungs, heart and abdomen
Organ malfunction: Malfunction of the pancreas' causes diabetes.
Personal Behaviors: By this I think you mean Personality Disorders. If it is so.. Then eg: Narcissistic personality disorder (NPD)
2)The job of the immune system — which is a collection of structures and processes within the body — is to protect against disease or other potentially damaging foreign bodies. When functioning properly, the immune system identifies a variety of threats, including viruses, bacteria and parasites, and distinguishes them from the body’s own healthy tissue.
On the opposite end of the spectrum, autoimmunity results from a hyperactive immune system attacking normal tissues as if they were foreign bodies.
Common autoimmune diseases include Hashimoto's thyroiditis, rheumatoid arthritis, diabetes mellitus type 1 and systemic lupus erythematosus.
3) CT Scan for diagnosis of tumors in brain ;Vaccination for the prevention of Polio.
4) Virus: Human immunodeficiency virus causes AIDS
Bacteria: Clostridium botulinum causes food poisoning.
Fungi: Candidiasis, also called thrush or moniliasis is a yeast infection caused by Candida albicans
Other Parasites: Entamoeba histolytica, a parasitic amoeba, causes amoebic dysentery, an intestinal disorder.