Havana syndrome is a mysterious illness that first appeared in 2016 near the city of Havana, Cuba. People in the area reported feeling strange symptoms like headache, dizziness, and ringing in their ears. Doctors were not able to figure out what was causing the illness, and many believe it could be related to a strange object that some people heard and saw around the same time. Some people think the object might have been a weapon or something else. Whatever the cause, people affected by Havana syndrome have struggled with their health since then and have not been able to get help from doctors.