The physical dimension of health refers to the bodily aspect of health. It refers to the more traditional definitions of health as the absence of disease and injury. Physical health ranges in quality along a continuum where a combination of diseases such as cancer, diabetes, cardiovascular disease, or hypertension are at one end and a person who is at optimum physical condition (think health not fitness) is at the other.
Physical health can affect the other dimensions of health as a decline in physical health can result in a decline in other forms of health. For example, a person who suddenly gets the flu struggles to focus in order to study or learn anything new, is often isolated socially so as not to infect others, and may feel sad as a result of their isolation.