Pericarditis

Inflammation of the sac-like layer that surrounds and protects the heart.
It has many causes: infectious, neoplastic, autoimmune, renal insufficiency, hypothyroidism, etc.
It manifests as a sharp pain in the chest that can radiate to the neck, shoulders, back, or abdomen. It gets worse when you lie down, take a deep breath, cough, or swallow. It usually improves with sitting down and bending forward.
Diagnosis is based on your medical history, a physical examination, an electrocardiogram, and may require an imaging test such as a chest x-ray or echocardiogram.
If a viral cause is suspected, rest and anti-inflammatory treatment may be sufficient. If a bacterial cause is suspected, antibiotic treatment and occasional draining of the fluid will be needed. In other situations, treatment depends on the underlying condition.
A patient with uncomplicated acute pericarditis may be treated as an outpatient. However, high-risk patients (high fever, significant pericardial effusion, heart failure, and failure to respond to anti-inflammatory therapy) should be admitted to the hospital for evaluation.