Final answer:
Severe mental illnesses, such as schizophrenia and major depression, are recognized across cultures. They can affect a person's thinking, mood, and ability to relate with others, significantly impacting their quality of life. Cultural interpretations and manifestations of these illnesses may vary.
Step-by-step explanation:
Mental illnesses are severe nervous system disorders that affect a person's thinking, mood, and ability to relate with others. These disorders have a significant impact on a person's quality of life and can make daily tasks challenging. Some common severe mental illnesses include schizophrenia, major depression, bipolar disorder, anxiety disorders, post-traumatic stress disorders, and obsessive-compulsive disorder (OCD). These severe mental illnesses are recognized across different cultures, although the cultural conceptualizations and manifestations of these illnesses may vary.