It is not a disease, but is the body's response to an outside stimulus, such as an infection. A fever of 100 degrees F in an infant is serious and a doctor should be called. For children over one year of age, a low fever is usually not as dangerous. It's rare, but a fever can major problems such as convulsions. The body temperature can quickly rise to life threatening degrees.
Hypertension is high blood pressure.
This is when the readings consistently are above 140 over 90. There may be no symptoms. The only way to know for sure is to have your blood pressure checked regularly. Your physician will work with you to develop a treatment plan. It may include weight management, limiting salt, limiting alcohol intake, quitting smoking, or exercising more.