And sometimes, fluid around the heart occurs for no reason that we can determine, which is known as idiopathic pericarditis. In fact, the most common cause of pericarditis is an idiopathic (or presumed) viral infection, which usually will go away on its own over time or with anti-inflammatory medications.
Lymph nodes become swollen in response to illness, infection, or stress. Swollen lymph nodes are one sign that your lymphatic system is working to rid your body of the responsible agents. Swollen lymph glands in the head and neck are normally caused by illnesses such as: ear infection.
Answer: Lymph nodes are filtering stations along the chain of lymph drainage fluid. Lymph drainage fluid drains the excess fluid from all parts of our body; the best example people are aware of of lymph nodes is when they get a strep throat and get swollen glands in their neck.