What is onset meaning?

Onset refers to the beginning or start of something, such as an illness, a symptom, a behavior, or a feeling. It can also refer to the time at which an event, situation, or process starts or begins. The onset may be gradual or sudden, depending on the situation. In medical terms, the onset of a disease or a symptom is an important factor in identifying its cause, diagnosis, and treatment. It can also be used to track the progression of an illness or condition over time. The onset is usually considered as the starting point of a process or an event, and it can have a significant impact on its outcome and overall course.