My youngest daughter (18) was diagnosed with pneumonia a few months back. At the same time I was diagnosed with bronchitis.
Shortly after, another daughter (28) came down with the same cough we had. She developed chest pain and an audible clicking noise in her chest that was eventually diagnosed as possible mitral valve prolapse by an emergency room doctor.
She saw her regular doctor before and after the ER visit. Each time he said he thought she had the pain because she had pulled a muscle.
The pain persisted and she finally got to see a cardiologist who thinks she had (viral) pericarditis (inflammation of the sac around the heart.)
It turned out that a non-steroidal anti-inflammatory drug was what she needed. The same type of drug her own doctor had recommended for the "pulled muscle."
I forgot to mention that getting a diagnosis of pneumonia took three attempts.
First my husband took her to our clinic, where the doctor said there was "no problem."
A night or two later I made a worried phone call to a doctor who was covering for our clinic and he said there was "no problem."
The next day we brought her in to "urgent visit" at the clinic and an X-ray showed she had pneumonia.