Medical follow-up is essential for several reasons: 1. Detection of Long-Term Effects: Some diseases or conditions may have delayed effects that only become apparent after an extended period. 2. Evaluation of Interventions: Follow-up allows for the assessment of treatment efficacy and the identification of any adverse effects. 3. Data Collection: It provides valuable data that can inform future public health policies and strategies. 4. Patient Care: Ensures that patients receive ongoing care and any necessary adjustments to their treatment plans.