Fits is nothing but seizures happen due to various reasons,in children below 5 years fit came during fever it's called febrile seizures ,it's common it's not continue throughout the life ..but while 15 years like that if seizures start ,it's due to genetic mutations or due to accidents ,brain injury if seizures continue its called epilepsy..all fits are not epilepsy ,but fits are the major symptom for epilepsy syndrome.
Seizures ( fit) arise in brain due to abnormal electric impulse in between nuerons this is basically medical related regarding epilepsy. ( According to my knowledge in astrology mercury rules nervous system ,so mercury role is important to get any nerve related issue ,it's a sudden electric impulse so mars involvement is must , rahu also very supportive for this syndrome moon rules fluids ,this syndrome occured due to neuro transmitters abnormal secretions ,if Satrun also involved it's become chronic…if we check lord ships lagna ,6th ,8th ,12 th house is must involved..if above mentioned planets have connection with this houses chances are more to get epilepsy