Whether or not parasites will grow if you eat too much crayfish depends on the environment in which the crayfish are grown and bred. Artificial breeding generally will not grow parasites, wild breeding is possible. 1. Artificial breeding: artificial breeding of crayfish waters are relatively clean, generally not affected by water pollution leading to the existence of crayfish parasites. Therefore, artificially bred crayfish eat more than the general will not grow parasites. 2. Wild breeding: wild breeding crayfish survival waters are poor, the body may contain a variety of parasites, especially with the main pneumonic schistosomiasis, so wild breeding crayfish eaten more than one is likely to grow parasites. If the above symptoms, it is recommended to go to the hospital in a timely manner, early formal treatment.