Menu Healthy Lifestyle Diseases & Conditions First Aid Symptoms Tests & Procedures Videos Definitions FAQs NoduleUpdated: 2018-05-26When to seek immediate medical careSee a doctor immediately if: A new lump or mass develops Unintentional weight loss, irregular heartbeat, and trouble sleeping Difficulty breathing or swallowing When to make a doctor's appointmentMake an appointment to see a doctor if: Changes in existing nodule © 1998-2022 Mayo Foundation for Medical Education and Research(MFMER). All rights reserved. Terms of Use