Trichinosis is caused by eating the larvae of a species of worm called Trichinella in raw or undercooked pork and wild game. Infections of trichinosis are found worldwide, especially where raw and undercooked meat is common. Symptoms include nausea, diarrhea, vomiting, fatigue, and fever early in an infection. Later, symptoms include headaches, chills, cough, swelled eyes, aching joints and muscle pain. Infection occurs when Trichinella cysts are ingested. The cysts are dissolved in the stomach acid and release the worms. The worms grow, mature and mate in the small intestines. The eggs hatch into immature worms that go into the bloodstream and then encyst (create cysts) inside the muscles. Infection can only be caused by ingestion of these cysts. Infection is easily avoided by fully cooking meat that is consumed.