Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Call emergency services for severe breathing difficulty, sudden tight neck swelling, fainting, coughing up significant blood, or severe chest pain.
Rapid swelling after thyroid surgery can place pressure on the airway and needs immediate treatment.
Seek urgent medical assessment for rapidly increasing neck swelling, fever with worsening wound symptoms, new shortness of breath, persistent vomiting, or chest pain.
And for anyone, someone who:
For routine advice, contact your surgical team if pain is not gradually improving, the wound becomes increasingly red or starts draining, your voice remains weak, or you have ongoing swallowing difficulty.
Also call if you develop tingling, cramps, or other possible signs of low calcium.
Every sign above is quoted from the sofidex article on Retrosternal thyroid surgery. If you are not sure, err upward — it is always reasonable to be checked.