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"Changed Behaviour" series
Physical changes in the person's brain could result in the parts of their brain that should regulate their behaviour deteriorating or no longer functioning. Changes in the person’s brain may also affect the person’s hearing (reduced hearing and/or distorted sound), which could affect the volume of their speech (resulting in routine shouting or screaming).
The person's communication skills may have diminished due to their dementia, leaving them with a more limited vocabulary, or they may be repeating language that they've heard in their earlier life or words that they feel a strong association with, like swear words.
The person may have an undiagnosed health condition (physical or mental) that is causing them to express themselves in this way – For example, sudden and acute verbal aggression may be attributable to an infection.
The person may not be able to explain that they are experiencing the side-effect(s) of medicine(s), which may lead to verbal aggression around taking medicines.
The person may have undiagnosed pain that they are trying to alert you to.