Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Go to an emergency department if:
These signs can indicate an open fracture, reduced blood flow, nerve injury, or significant soft-tissue damage.
Seek urgent medical assessment if the toe is clearly bent or rotated, the big toe may be broken, pain is severe despite basic measures, or there is a large painful collection of blood beneath the nail.
Do not try to drain blood from under the nail yourself.
Prompt advice is also sensible if you have diabetes, poor circulation, reduced feeling in your feet, a weakened immune system, or fragile skin.
These conditions can affect wound healing and make complications harder to notice.
Arrange routine follow-up if pain and swelling are not starting to improve, walking remains difficult, the toe repeatedly rubs against footwear, or symptoms return as activity increases.
Ongoing pain after the expected healing period may need another examination or further imaging.
Every sign above is quoted from the sofidex article on Toe fracture. If you are not sure, err upward — it is always reasonable to be checked.