Multiple outlets report that NHS guidance urges people taking sertraline to seek urgent medical advice if they notice a particular chest-related symptom. The reports say the advice is to “call 111,” which is used in England and Scotland for non-emergency medical guidance and assessment. The outlets describe the symptom as a potential warning sign of a rare but serious side effect, and they emphasize that patients should not ignore it or wait for routine review. The coverage also notes that sertraline is widely prescribed for depression and anxiety, and that patients should be alert to changes in how they feel while taking the medicine. In line with NHS safety information, the guidance focuses on prompt action when the chest symptom occurs, regardless of whether the person has taken sertraline for a short or long time. The reporting is consistent in that it frames the advice as precautionary and centered on ensuring timely assessment.