FACTORS THAT AFFECT MENTAL DISORDERS HEREDITY • this is the most frequent with family histories revealing mental illnesses INCESTUOUS MARRIAGES • Blood incompatibility of parents, maternal infection during the early stages of pregnancy are some disorders associated with incestuous marriages * IMPAIRED VITALITY • Mental worry, grief, physical, strain, unhygienic surroundings, infections and birth trauma may predispose a person to mental disorders POOR MORAL VALUES TRAINING AND BREEDING • Improper breeding and poor moral values training particularly those affecting free will and self-control, undesirable associations, etc., may result in an impaired mental state EMOTIONAL DISTURBANCES • Such as love, hatred, passion, frustration and disappointment PHYSICAL FACTORS NON-TOXIC TOXIC • Exhaustion resulting from severe physical and mental strain, illness, cerebral hemorrhage, trauma on the skull affecting the brain • This may be produced by excessive formation or deficient elimination of waste products; by infection, or excessive use of certain drugs