Yes, there are high chances that the symptoms of malaria can relapse if you do not follow the treatment properly or if malaria is caused by either the P. ovale or P. vivax. It is reported that one in seven people with these types of malaria may suffer from relapse. Patients with P. vivax and P. ovale infections who have recovered from the current episode might suffer again after months or even years without showing any symptoms. This is because P. vivax and P. ovale parasites might remain dormant in the liver for years which may reactivate any time, especially when the immunity is low.