It could be said that mathematics is the language of physics. That is another way of better understanding what is physics. Numerical values, units of measurement, and similar concepts are all mathematical in nature, and are used to describe physical quantities in the most accurate and precise manner.
In brief: Cough headache. There are a couple of possibilities. Coughing can raise the pressure inside your head, which can cause pain sometimes. There is also a poorly-understood entity called the primary cough headache,  that is associated with coughing, straining, laughing, crying, etc.
This inflammation can be caused by an infection or happen after heart attack or heart surgery. Pain from myocarditis or pericarditis is usually is sharp and in the center of the chest. It tends to get worse when you breathe, lie down, cough or swallow. Sitting or leaning forward sometimes reduces the pain.