Thyroid cancer may not always present with early warning signs, and symptoms can vary among individuals. However, some common signs and symptoms that could indicate thyroid cancer include a lump or swelling in the neck, changes in voice, difficulty swallowing, persistent hoarseness, enlarged lymph nodes, persistent cough, unexplained weight loss, and neck pain. It's important to note that these symptoms can also be caused by other non-cancerous conditions. If any concerning symptoms are present, it is advisable to consult with a healthcare professional for proper evaluation and diagnosis. They can conduct further tests, such as imaging studies and biopsies, to determine the cause of the symptoms.