Pericarditis is inflammation of the pericardium, the sac surrounding the heart. It commonly causes sharp chest pain that may spread to the shoulder or neck. Symptoms include cough, fatigue, fever and palpitations. Pericarditis is usually mild and resolves without treatment, but more severe cases may require medications or rarely surgery. Diagnosis involves listening to heart sounds and tests like EKG, echocardiogram and blood tests. Causes can include infection, autoimmune diseases, injury or other health conditions. Complications include fluid buildup around the heart or thickening of the pericardium.