Symptoms of Schizophrenia appear when one of the neural circuit situated in the midbrain, called Substantia nigra, overproduce neurotransmitter called Dopamine and disrupts the balance between secretion of Dopamine and Acetylcholine.
Autoimmune hepatitis also tends to be associated with other diseases, like Hashimoto's thyroiditis, where your immune cells attack your thyroid, and Grave's disease, where your thyroid overproduces thyroid hormones.