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Health effect. Health effects (or health impacts) are changes in health resulting from exposure to a source. Health effects are an important consideration in many areas, such as hygiene, pollution studies, occupational safety and health, nutrition and health sciences in general.
For example, a mental health condition can affect your: 1  Behavior. Obsessive hand-washing or drinking too much alcohol might be a sign of a mental health condition. 2  Feelings. Sometimes a mental health condition is characterized by a deep or ongoing sadness, euphoria or anger. 3  Thinking.