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Persistence is particularly important. The human body changes constantly, and many minor symptoms resolve naturally within days. Something that continues for weeks, repeatedly returns, grows worse, or differs noticeably from a person’s usual health pattern deserves more attention. This does not mean waiting a fixed number of weeks in every situation before seeking care. Some symptoms, such as coughing up significant blood, severe breathing difficulty, sudden neurological symptoms, or other potentially urgent problems, may require faster assessment. Urgency depends on the symptom and its severity.