I have a headache with ear ache and a swollen jaw, what could this be?

MAY BE INFECTION: May be you have an abscess of the face, but it needs to be checked to make diagnosis, it may be something else as well.

Viral infection: From the sparse details given, i can reasonably conclude you are suffering from a viral infection (common at this time of year). Ear aches and accompanied swollen lymph nodes in the neck area are not uncommon. If you start to have a significant fever, an md consult would be of benefit.

Infection: Sounds like an oral or jaw infection. See oral surgeon ASAP.

Infection: But it can also be a cyst.. Your post did not say you long you have the swelling or if you have been treated recently by a dentist. Now is the time to call your dentist for an appointment for diagnosis & treatment.

Dental abscess: As described it is likely an infection around the base of a tooth (=dental abscess), or possibly an obstruction of the parotid gland in your cheek that makes saliva. Either swell up and cause pain. Usually either can be addressed by your regular doctor or in an urgent care center. A dentist can also often address both conditions as well.

A few things: The swollen jaw suggests infection. Other problems like tumors of the jaw or saliva gland can give the same symptoms. Best advice is to see a board certified oral & maxillofacial surgeon for exam/diagnosis/treatment recommendations.