Characteristics may further be described as being interspecific, intraspecific, and conspecific. Interspecific Interspecificity (literally between/among species), or being interspecific, describes issues between individuals of separate species.
Coronary heart disease (CAD) is the most common of many types of heart disease, not only in men but also in women. It is caused by atherosclerosis, or hardening of the arteries, which occurs when plaque from cholesterol and other substances accumulate in the arteries.
Fatigue is a symptom of an underlying disease and is described in many ways from feeling weak to being constantly tired or lacking energy. There may be other associated symptoms depending upon the underlying cause. 1  Individuals with heart disease, lung disease, or anemia may complain of associated shortness of breath or tiring easily with minimal activity.