Final answer:
Infections, genetic variation, and neurotransmitter imbalances may be involved in the development of mental illness.
Step-by-step explanation:
One biological factor that may be involved in the development of mental illness is infections. Infections, such as those caused by viruses or bacteria, can affect the brain and lead to mental health disorders. For example, certain viral infections like encephalitis can cause inflammation in the brain and result in psychiatric symptoms.
Another biological factor that may contribute to mental illness is genetic variation. Some mental health disorders have a hereditary component, meaning they can be passed down through genes. This genetic predisposition can increase the risk of developing a mental illness.
Additionally, imbalances in neurotransmitters, which are chemicals that help transmit signals in the brain, can also play a role in mental illness. For instance, low levels of serotonin, a neurotransmitter involved in mood regulation, have been associated with depression.
Learn more about Biological factors in mental illness development