The most common initial symptom of cavernous sinus thrombosis is a headache.
This usually develops as a sharp pain located behind or around the eyes that steadily gets worse over time.
It can be several days, or even weeks, before additional symptoms develop after the headache starts.
In very rare cases, cavernous sinus thrombosis can occur after having some types of coronavirus (COVID-19) vaccine. If this happens, symptoms can appear between 4 days and 4 weeks after vaccination.
In most cases of cavernous sinus thrombosis, the eyes are affected. You may experience:
Other symptoms of cavernous sinus thrombosis include:
These symptoms usually occur if cavernous sinus thrombosis is left untreated, or if an infection causing the condition spreads throughout the body.
Without treatment, most people with cavernous sinus thrombosis will become increasingly drowsy and eventually fall into a coma.
Call 111 immediately if you experience:
While it's highly unlikely to be caused by a cavernous sinus thrombosis, these symptoms need further investigation.
In very rare cases, these symptoms may appear from around 4 days to 4 weeks after being vaccinated with the coronavirus (COVID-19) vaccine.
You should also contact a GP if you develop any of the eye symptoms described above.