Fever can be indicator that the organism is fighting against something foreign that attacked it, like viruses, or bacteria, or some other, more serious sickness like cancer. In most cases it is harmless, but if it persists and is too high, it might cause some complications.
If a person has been exposed to a heat source (sun, a room that was too hot, etc.), and/or was overdressed at the time, fever can be result of a heat stroke, in which case immediate medical attention is mandatory.
Note: As this is a health-related problem, we suggest that you consult with your doctor first.
Can teething cause high fever? - Possibly, yes. Can can a high fever cause a seizure? - Possibly, yes. Can a high fever cause a stroke? - Possibly yes! Fever itself is not harmful. Basically, it may appear when the organism responds to the threat such as viruses and bacteria, by raising the temperature, attempting to kill them.
You should seek medical attention immediately if you have high fever temperature, i.e. should the fever go beyond 105 degrees Fahrenheit (40.5 degrees Celsius) (if you measured it from your armpit); 104.6 (mouth temperature)/105.6 (rectal or ear temperature) Fahrenheit; 40.4 (mouth)/40.9 (rectal/ear) in Celsius.
The bar goes lower when it comes to children, especially babies and toddlers. Their immune systems are not yet developed properly, therefore you should pay extra care. This article on Clevelandclinic is a page that might help you determine the severity of your child's temperature.
The elderly should keep track of their hight temperature, and report it to the doctor as soon as possible. Because their organism biologically changes due to the process of aging, it is susceptible to many illnesses, and the fever should never be taken lightly. This article on Oxfordjournals will help you understand it better and tell you what exact measures you should take.
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