I get ingrown toenails frequently. Is this the sign of something more serious?
Yes. Ingrown toenails are serious. They can be painful and can lead to infections of the toe, which can ultimately spread to the foot and further.
Yes they can be serious because of the risk of infection, you should definitely see a professional for further information. There are some medications (chemotherapeutic agents mostly) than can also cause similar symptoms. Again, you should see a specialist.