A few possible side effects of LASIK includes flap-related complications, which includes a wide gamut of complications such as flap dislodgement, flap wrinkles, Sands of Sahara, flap infection, etc.
During the flap cutting step of LASIK, multiple nerve endings will be severed and this may result in chronic dry eyes.
Other complications which are common to LASIK and other laser vision correction procedures are under/over-correction, eye infection, corneal haze, etc.
Though the above-mentioned complications are rare, you should only undergo the procedure under the hands of an experienced eye surgeon. I will always advise my patients to conduct a thorough research on the types of procedures, doctor's credentials, etc prior to committing themselves to the procedure.