There may be parasites growing inside the head, which belongs to brain parasitic disease.1. Brain parasitic disease is caused by the invasion of parasitic worms, larvae, or eggs into the human brain tissue, which may be transmitted through the bloodstream or in some ways, leading to damage to the brain tissue of the patient and causing some symptoms. The clinical symptoms of the patients are mainly related to the location of the parasites as well as the number and scope of the parasites, and the degree of damage to the surrounding brain tissues.2. The symptoms caused by intracerebral parasites are more complicated and diversified, and the intracerebral parasites may enter into the brain tissues of human beings through the channels of blood circulation, lymphatic system or conjunctiva, nasal mucosa, etc., and they can parasitize in any part of the brain. When the number of worms gradually increases, it will produce occupying, squeezing and destructive effects, and the patient may show severe headache, nausea, vomiting, and seizures.